Private placement Private Placement [Member] Other non-current liabilities Other Liabilities, Noncurrent Vice President, Investor Relations & Administration Vice President, Investor Relations & Administration [Member] Vice President, Investor Relations & Administration Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Title of Individual [Axis] Title of Individual [Axis] Asset Held for Sale Asset Held For Sale [Policy Text Block] Represents asset held for sale. Histogenics Histogenics Corporation [Member] Represents Histogenics Corporation. Company borrowed Long-term Line of Credit City Area Code City Area Code Leases Lessee, Leases [Policy Text Block] Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2021 Finance Lease, Liability, Payments, Due Year Two Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Total current liabilities Liabilities, Current Title of 12(b) Security Title of 12(b) Security Weighted average exercise price, options exercisable (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Earnings Per Share [Abstract] Earnings Per Share [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Financing SPA Securities Purchase Agreement [Member] Represents the information pertaining to Securities Purchase Agreement entered with several investors. Schedule of maturities of operating leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Recently Adopted Accounting Standards and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Principal outstanding Long-term Debt, Gross Percentage of increase in purchase price of asset per month (in percentage) Percentage of Increase In Purchase Price Of Asset Per Month Percentage of asset purchase agreement that the purchase price increases per month between October 31, 2019 and the closing date if agreement is not terminated. Nature of Business Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Assets Assets [Abstract] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Convertible preferred stock, par value (in USD per share) Preferred Stock, Par or Stated Value Per Share Proceeds from warrant exercises, maximum amount Proceeds From Qualified Equity Financing, Maximum Amount In Order To Be Excluded As Anti-Dilution Adjustment Proceeds From Qualified Equity Financing, Maximum Amount In Order To Be Excluded As Anti-Dilution Adjustment Accrued Liabilities, Current [Abstract] Accrued Liabilities, Current [Abstract] Weighted-average remaining lease terms—operating leases (years) Operating Lease, Weighted Average Remaining Lease Term Entity Address, Postal Zip Code Entity Address, Postal Zip Code Total lease cost Lease, Cost June 2018 Convertible Debt June2018 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in June 2018. Reverse stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Options outstanding, beginning balance (in shares) Number of shares, options outstanding, beginning balance (in shares) Number of shares, options outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Maximum borrowing Line of Credit Facility, Maximum Borrowing Capacity Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Nature of Business Nature of Operations [Text Block] Total operating expenses Operating Expenses Less: present value adjustment Finance Lease, Liability, Undiscounted Excess Amount Property and equipment, net Property, Plant and Equipment, Net Other income (expense) Nonoperating Income (Expense) [Abstract] November 2018 Convertible Debt November2018 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in November 2018. Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Chief Financial Officer Chief Financial Officer [Member] Total assets Assets Entity Shell Company Entity Shell Company Total lease liabilities Operating Lease, Liability Cover [Abstract] Weighted average remaining contractual life, options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Document Type Document Type Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Less: present value adjustment Lessee, Operating Lease, Liability, Undiscounted Excess Amount Subsequent events Subsequent Event [Member] Redemption multiple upon default Debt, Redemption Multiple Feature Redemption multiple of debt's principal and unpaid interest upon consummation of the sale of all or substantially all of the assets of the Company, change in control or event of default Net loss per share of common stock - basic and diluted (in USD per share) Earnings Per Share, Basic and Diluted Asset purchase agreement, cash consideration Asset purchase agreement, cash consideration The amount of cash consideration agreed under the asset purchase agreement. Shares issued exchange rate to former Ocugen's stockholders (in USD per share) Business Combination, Issued Shares Exchange Rate The exchange rate of share issued to shares surrendered by stockholder of the acquired entity in a business combination. Warrants and rights outstanding, term Warrants and Rights Outstanding, Term Percentage of amount on market value for failure to issue common stock on pre-merger financing warrants (in percentage) Percentage Of Amount On Market value For Failure To Issue Common Stock On Pre-Merger Financing Warrants If company fails to issue to a holder of the Pre-Merger Financing Warrants the number of shares of common stock to which such holder is entitled upon such holder's exercise of the such warrants, then company shall be obligated to pay the holder on each day while such failure is continuing an amount equal to percentage of the market value of the undelivered shares determined using any trading price of the common stock. Share-based Payment Arrangement [Abstract] General and administrative General and Administrative Expense [Member] Percentage of volume-weighted average trading price of a share of common stock that triggered release of converted additional shares (in percentage) Converted Additional Shares, Threshold Release Trigger The percentage of the volume-weighted average trading price of a share of common stock as quoted on the Nasdaq Capital Market for the first three trading days immediately following the closing date of the Pre-Merger Financing as threshold to release converted additional shares. Total Finance Lease, Liability, Payment, Due Debt Disclosure [Abstract] Debt Disclosure [Abstract] Current liabilities Liabilities, Current [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Income Statement Location [Domain] Income Statement Location [Domain] Plus: accrued interest Interest Payable Statistical Measurement [Axis] Statistical Measurement [Axis] Interest rate (as a percent) Lessee, Finance Lease, Discount Rate Weighted-average discount rate—operating leases (in percentage) Operating Lease, Weighted Average Discount Rate, Percent Schedule of supplemental balance sheet information related to leases Supplemental balance sheet information leases [table text block] Tabular disclosure of balance sheet information related to leases. Aggregate purchase price Sale of Stock And Issuance Of Warrants, Consideration Received Per Transaction Sale of Stock And Issuance Of Warrants, Consideration Received Per Transaction Aggregate intrinsic value, beginning balance Aggregate intrinsic value, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Lines of credit Lines of Credit, Fair Value Disclosure Automatic increase in shares to be issued (in percentage) Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase In Shares To Be Issue, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase In Shares To Be Issue, Percentage Effect of changes in exchange rate on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Convertible preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Document Quarterly Report Document Quarterly Report Commitments and contingencies (Note 8) Commitments and Contingencies Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Extinguishment of debt loss Gain (Loss) on Extinguishment of Debt Debt Debt Instrument [Line Items] Schedule of cash, cash equivalents, and restricted cash Schedule of Cash and Cash Equivalents, Restricted Cash [Table Text Block] Tabular disclosure of the components of cash and cash equivalents, restricted cash. Weighted average shares outstanding - basic and diluted (in shares) Shares used in calculating net loss per common share—basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Initial exercise price (in USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Debt Debt Disclosure [Text Block] Options exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Variable lease cost Variable Lease, Cost Common stock, shares authorized (in shares) Common Stock, Shares Authorized November 2018 and December 2018 Notes November 2018 And December 2018 Notes [Member] November 2018 And December 2018 Notes Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Price per share (in USD per share) Sale of Stock, Price Per Share Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Clinical Accrued Liabilities, Clinical Accrued Liabilities, Clinical Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Leases Lessee, Lease, Description [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Percentage of excess common stock on pre-merger financing warrants exercised two (in percentage) Percentage Of Excess Common Stock On Pre-Merger Financing Warrants Two The exercise of the Pre-Merger Financing Warrants if, as a result of such exercise, the holder, together with its affiliates would beneficially own in excess percentage two of the outstanding common stock. Basis of Presentation Basis of Accounting [Text Block] Sale of Stock [Domain] Sale of Stock [Domain] Operating lease obligation Current lease obligations Operating Lease, Liability, Current Schedule of basic and diluted earnings per share of common stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Series A Warrants Series A Warrants [Member] This member stands for Series A Warrants. Treasury Stock Treasury Stock [Member] Long term debt, net Long-term Debt, Excluding Current Maturities Note principal outstanding Convertible Debt Document Fiscal Period Focus Document Fiscal Period Focus Shares issued (in shares) Shares, Issued Employee-related Employee-related Liabilities, Current Treasury Stock, at cost, 121,500 shares at March 31, 2020 and December 31, 2019 Treasury Stock, Value Remainder of 2020 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Level 2 Fair Value, Inputs, Level 2 [Member] Leases, term of contract (in years) Lessee, Operating Lease, Term of Contract Asset held for sale Assets Held-for-sale, Not Part of Disposal Group, Current Schedule of maturities of finance leases Finance Lease, Liability, Maturity [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Paycheck protection program loan Paycheck Protection Program Loan [Member] Paycheck Protection Program Loan Potentially dilutive securities Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Loss from operations Operating Income (Loss) Reverse Merger And Financing Disclosure [Table] Reverse Merger And Financing Disclosure [Table] Disclosure of information about reverse merger and financing. Percentage of excess common stock on pre-merger financing warrants exercised one (in percentage) Percentage Of Excess Common Stock On Pre-Merger Financing Warrants One The exercise of the Pre-Merger Financing Warrants if, as a result of such exercise, the holder, together with its affiliates would beneficially own in excess percentage one of the outstanding common stock. Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Warrants Warrant [Member] Convertible preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Statement [Line Items] Statement [Line Items] Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Other assets Other Assets, Noncurrent Remainder of 2020 Finance Lease, Liability, Payments, Remainder of Fiscal Year Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Beginning balance, weighted average exercise price (in USD per share) Ending balance, weighted average exercise price (in USD per share) Beginning balance, weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Derivative Contract [Domain] Derivative Contract [Domain] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Plan Name [Axis] Plan Name [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Price over which trading price of common stock as quoted on the Nasdaq Capital Market was considered for the release of converted additional shares (in USD per share) Converted Additional Shares, Threshold Release Trigger Price The price over which 80% of the arithmetic average of the two lowest dollar volume-weighted average prices of a share of common stock on the NASDAQ Capital Market during the applicable Reset Period immediately preceding the applicable Reset Date to date to release converted additional shares is determined. Accretion of debt discount Amortization of Debt Discount (Premium) Carrying Value upon Issuance Long-term Debt Schedule of accrued expenses Schedule of Accrued Liabilities [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Reverse Merger and Financing Reverse Merger And Financing Disclosure [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Amendment Flag Amendment Flag Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Convertible Notes - Board Of Directors Convertible Notes, Board Of Directors [Member] Convertible Notes, Board Of Directors Warrants, exercise price determination, number of trading days Class Of Warrant Or Right, Exercise Price Determination, Number Of Trading Days Considered The number of trading days considered for determination of exercise price of warrants. Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Senior Vice President, Regulatory and Quality Senior Vice President, Regulatory and Quality [Member] Senior Vice President, Regulatory and Quality Interest expense Interest Expense Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Board members Director [Member] Non-cash interest expense Non-Cash Interest Expense Amount of non-cash interest expense during the period. Total non-current liabilities Liabilities, Noncurrent Plan Name [Domain] Plan Name [Domain] Common stock, value, subscriptions Common Stock, Value, Subscriptions Other current liabilities Other Liabilities, Current Sale of Stock [Axis] Sale of Stock [Axis] Use of Estimates Use of Estimates, Policy [Policy Text Block] Subsequent Event [Table] Subsequent Event [Table] Unrecognized compensation expense related to options outstanding, weighted average period for expense to be recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Accounting Policies [Abstract] Accounting Policies [Abstract] Pre-Merger Financing Warrants Pre-Merger Financing Warrants No definition available. Additional Paid in Capital Additional Paid-in Capital [Member] Local Phone Number Local Phone Number Interest income Investment Income, Interest Title of Individual [Domain] Title of Individual [Domain] Number Of Equity Compensation Plans Number Of Equity Compensation Plans Number Of Equity Compensation Plans Total Lessee, Operating Lease, Liability, Payments, Due Stock-based compensation Share-based Payment Arrangement [Policy Text Block] Series B Warrants Series B Warrants [Member] This member stands for Series B Warrants. Total other income (expense) Nonoperating Income (Expense) Additional paid-in capital Additional Paid in Capital Interest rate (in percentage) Debt Instrument, Interest Rate, Stated Percentage Payment of debt issuance costs Payments of Financing Costs Schedule of Stock-based Compensation Expense for Options Granted Reflected in the Consolidate Statement of Operations and Comprehensive Loss Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Other comprehensive income (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Entity Address, Address Line One Entity Address, Address Line One Chief Executive Officer Chief Executive Officer [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Entity Address, Address Line Two Entity Address, Address Line Two Borrowing increments Line Of Credit Borrowing Each Draw The amount of borrowing that can be borrowed each draw from a line of credit Business Combinations [Abstract] Business Combinations [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Entity Address, State or Province Entity Address, State or Province Income Statement Location [Axis] Income Statement Location [Axis] Business Acquisition [Axis] Business Acquisition [Axis] Total current assets Assets, Current Entity Current Reporting Status Entity Current Reporting Status Treasury stock (in shares) Treasury Stock, Common, Shares Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period April 2020 notes April 2020 Notes [Member] April 2020 Notes Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Non-current liabilities Liabilities, Noncurrent [Abstract] Net loss Net loss Net loss—basic and diluted Net Income (Loss) Attributable to Parent Loans payable Loans Payable [Member] Common Stock Common Stock [Member] Current assets Assets, Current [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Merger and Financing Business Acquisition [Line Items] Debt Instrument [Axis] Debt Instrument [Axis] General and administrative General and Administrative Expense Accounts payable Accounts Payable, Current Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted cash Restricted Cash, Noncurrent Pre-Merger Financing Warrants Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Class of warrant or right, exercisable (in shares) Class of Warrant or Right, Exercisable Class of Warrant or Right, Exercisable 2019 Plan 2019 Plan [Member] 2019 Plan Conversion price discount per original agreement (in a percentage) Convertible Debt, Equity Financing Triggered, Discount Percentage of discount of the convertible debt that automatically convert the same class of equity as those issued to the lowest price per share being paid by investors in the equity financing. Number of warrants outstanding (in shares) Class of Warrant or Right, Outstanding Former Ocugen Warrants Former Ocugen Warrants [Member] Former Ocugen Warrants Operating lease cost Operating Lease, Cost Accrued expenses Total Accrued Liabilities, Current Entity Small Business Entity Small Business Professional fees Accrued Liabilities, Professional Fees Accrued Liabilities, Professional Fees Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Entity Interactive Data Current Entity Interactive Data Current Common stock, shares issued (in shares) Common Stock, Shares, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Entity Filer Category Entity Filer Category Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Other Other Accrued Liabilities, Current Stock-based compensation expense Share-based Payment Arrangement, Expense Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Total liabilities and stockholders’ equity Liabilities and Equity Common stock issued upon conversion (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Entity Address, City or Town Entity Address, City or Town Change in fair value of derivative liabilities Change in fair value of derivative liability Liabilities, Fair Value Adjustment Net Loss Per Share of Common Stock Earnings Per Share [Text Block] February 2019 Convertible Debt February2019 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in February 2019. Number of shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Operating lease obligation, less current portion Non-current lease obligations Operating Lease, Liability, Noncurrent Award Type [Domain] Award Type [Domain] Operating expenses Operating Expenses [Abstract] Commitments Commitments and Contingencies Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Convertible preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Present value of minimum lease payments Finance Lease, Liability Weighted average exercise price, granted (in USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price January 2019 and February 2019 Notes January 2019 And February 2019 Notes [Member] January 2019 And February 2019 Notes Principles of Consolidation Consolidation, Policy [Policy Text Block] Increase in Additional paid-in capital from conversion Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Options, grants in period, weighted average grant date fair value (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Series C Warrants Series C Warrants [Member] This member stands for Series C Warrants. Subsequent Events Subsequent Events [Text Block] Research and development Research and Development Expense [Member] Schedule of Debt Schedule of Long-term Debt Instruments [Table Text Block] Lease obligations Increase (Decrease) In Lease Obligations Increase (Decrease) In Lease Obligations Right-of-use asset related to operating leases (Note 8) Noncash or Part Noncash, Operating Lease, Right-of-Use Asset Right-to-use asset recognized upon adoption of ASU 2018-11. Quoted price of assets held for sale of NeoCart Assets Held-for-sale, Long Lived, Fair Value Disclosure EB-5 Loan E B5 Program Borrowings [Member] Represents borrowings from the U.S. government's Immigrant Investor Program, commonly known as the EB 5 program (the "EB 5 Program"). Number of common shares in to which the warrants are exercisable (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Total liabilities Liabilities Schedule of potentially dilutive securities excluded from computation of diluted weighted average shares Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Award Type [Axis] Award Type [Axis] Common stock, $0.01 par value, 200,000,000 authorized, 52,746,728 shares issued and 52,625,228 shares outstanding at March 31, 2020 and December 31, 2019 Common Stock, Value, Issued Proceeds from issuance of debt Proceeds from Long-term Lines of Credit Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Research and development Research and Development Expense Chief Scientific Officer Chief Science Officer [Member] Chief Science Officer Other income (expense) Other Nonoperating Income (Expense) Subsequent Events [Abstract] Subsequent Events [Abstract] Weighted average exercise price, cancelled (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Percentage of principal amount required to be redeemed, if company financing transaction generates cash in year one (in percentage) Debt Instrument, Percentage of Principal Amount Required To Be Redeemed, If Company Financing Transaction Generates Cash on or prior to August 22, 2020 Debt Instrument, Percentage of Principal Amount Required To Be Redeemed, If Company Financing Transaction Generates Cash on or prior to August 22, 2020. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Merger and Financing Mergers, Acquisitions and Dispositions Disclosures [Text Block] 2014 Plan 2014 Plan [Member] 2014 Plan Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accumulated Deficit Retained Earnings [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Subsequent Events Subsequent Event [Line Items] Right-of-use assets, net Operating Lease, Right-of-Use Asset Additional Disclosures Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Equity Components [Axis] Equity Components [Axis] December 2018 Convertible Debt December2018 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in December 2018. RECENT ACCOUNTING PRONOUNCEMENTS New Accounting Pronouncements or Change in Accounting Principle [Line Items] Document Period End Date Document Period End Date Statement [Table] Statement [Table] Entity Registrant Name Entity Registrant Name Supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Principal, Embedded Derivatives and Carrying Value of Debts Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Total stockholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Supplemental disclosure of non-cash transactions: Supplemental Cash Flow Elements [Abstract] Fair Value of Embedded Derivatives Convertible Debt Conversion Feature [Member] Conversion feature of the convertible debt that is considered as an embedded derivative of the debt. Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Convertible Notes Convertible Debt [Member] Maximum Maximum [Member] 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three Schedule of components of lease expense Lease, Cost [Table Text Block] Non-cash lease expense Noncash Lease Expense Noncash Lease Expense Beginning balance, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Shares issued, price per share (in USD per share) Shares Issued, Price Per Share January 2018 Convertible Debt January2018 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in January 2018. Fair Value of Embedded Derivatives Embedded Derivative, Fair Value of Embedded Derivative Liability Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Accumulated deficit Retained Earnings (Accumulated Deficit) Convertible preferred stock, $0.01 par value, 10,000,000 shares authorized, seven issued and outstanding at March 31, 2020 and December 31, 2019 Preferred Stock, Value, Issued Security Exchange Name Security Exchange Name Entity Tax Identification Number Entity Tax Identification Number Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Note Principal Amount Debt Instrument, Face Amount Depreciation expense Depreciation Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Trading Symbol Trading Symbol Minimum Minimum [Member] Document Transition Report Document Transition Report Chief Medical Officer Chief Medical Officer [Member] Chief Medical Officer Share-based payment arrangement, option Share-based Payment Arrangement, Option [Member] Less: unamortized debt issuance costs Debt Issuance Costs, Net Notes Issued Notes Issued Warrants Warrants [Text Block] Warrants Debt Issuance Costs Debt Issuance Costs, Gross Financing lease principal payments Finance Lease, Principal Payments Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Maturity term (in months) Debt Instrument, Term Options to purchase common stock Equity Option [Member] January 2019 Convertible Debt January2019 [Member] Borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock, issued in January 2019. Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Research and development Research And Development Expenses Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for research and development. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Aggregate intrinsic value, options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Entity [Domain] Entity [Domain] Stock-based Compensation Share-based Payment Arrangement [Text Block] Percentage of principal amount required to be redeemed, if company financing transaction generates cash in year two (in percentage) Debt Instrument, Percentage of Principal Amount Required To Be Redeemed, If Company Financing Transaction Generates Cash after August 22, 2020 Debt Instrument, Percentage of Principal Amount Required To Be Redeemed, If Company Financing Transaction Generates Cash after August 22, 2020 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two