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[Member] Chiesi Farmaceutici S.p.A and Chiesi USA, Inc. Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Term of awards (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Collaborative Arrangements Collaborative Arrangement, Accounting Policy [Policy Text Block] Other assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gain on debt extinguishment Gain on debt extinguishment Gain on debt extinguishment Gain (Loss) on Extinguishment of Debt Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value 2019 Employee Stock Purchase Plan Two Thousand Nineteen Employee Stock Purchase Plan [Member] Two thousand nineteen employee stock purchase plan. Convertible notes, redemption percentage Debt Instrument, Redemption Price, Percentage Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Exercise of warrants (in shares) Stock Issued During Period, Shares, Warrant Exercised Stock Issued During Period, Shares, Warrant Exercised Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Long-term contract liabilities Contract with Customer, Liability, Noncurrent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Aggregate Intrinsic Value, Options vested and expected to vest as of end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Warrant term (in years) Warrants and Rights Outstanding, Term Commitments and contingencies (Note 9) Commitments and Contingencies Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Investment in merger option through issuance of stock Stock Issued During Period, Value, Purchase of Assets Accrued research and development expenses Accrued Research And Development Expenses Accrued research and development expenses. 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PAH and PH-ILD Commercialization Activities PAH And PH-ILD Commercialization Activities [Member] PAH And PH-ILD Commercialization Activities Shares price (in USD per share) Share Price Operating lease, term of contract Lessee, Operating Lease, Term of Contract Weighted-Average Remaining Contractual Life (in years), Options exercisable as of end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted-Average Remaining Contractual Term PEO Name PEO Name Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities Contract liability Opening balance Ending balance Contract with Customer, Liability Debt instrument covenant minimum liquidity step down amount Debt Instrument, Covenant, Minimum Liquidity Step Down, Amount Debt Instrument, Covenant, Minimum Liquidity Step Down, Amount Other segment items Segment Reporting, Other Segment Item, Amount Major Customer and Concentration of Credit Risk/ 5.00% Convertible Senior Notes due 2027 (the “2027 Notes”)/ 7.50% Convertible Senior Notes due 2030 (the “2030 Notes”) Concentration Risk, Credit Risk, Policy [Policy Text Block] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Total interest expense related to the 2027 Notes Interest Expense, Debt Greater than one year Debt Securities, Available-for-Sale, Noncurrent Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Option exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Revenue Recognition Revenue [Policy Text Block] Cash and cash equivalents, at the beginning of the period Cash and cash equivalents, at the end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Effect of exchange rate changes on revenue Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Accounts payable Increase (Decrease) in Accounts Payable Accrued other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Vesting of restricted stock (in shares) Stock Issued During Period Shares Vesting Of Restricted Stock Stock issued during period shares vesting of restricted stock. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Restructuring and related cost, number of positions eliminated Restructuring and Related Cost, Number of Positions Eliminated Debt Instrument Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total lease cost Lease, Cost Purchase of common stock through payroll deductions, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Number of share issued under ESPP (in shares) Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Number of additional shares issued for issuance under share-based payment arrangement. Issuance of common stock and warrants in connection with the exchange of the 2027 Notes, net of issuance costs (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Development cost reimbursement payment Contract With Customer, Liability, Development Cost Contract With Customer, Liability, Development Cost Customer [Domain] Customer [Domain] Long-term Debt, Type Long-Term Debt, Type [Domain] Net income (loss) per share, basic (in dollars per share) Basic earnings (loss) per common share (in dollars per share) Earnings Per Share, Basic 2017 Equity Incentive Plan Two Thousand Seventeen Equity Incentive Plan [Member] Two thousand seventeen equity incentive plan. Current contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Short-term lease cost Short-Term Lease, Cost Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Receivable from contracts with collaborators Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Warrant liability at fair value Warrant liability Warrant Liability, Fair Value, Current Warrant Liability, Fair Value, Current U.S. Treasury and agency securities and corporate debt securities Total Fair Value Total Debt Securities, Available-for-Sale Operating lease cost Operating Lease, Cost Deduct the gain on debt extinguishment Extinguishment of Debt, Gain (Loss), Net of Tax Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Restructuring and related cost, percentage of positions eliminated to total workforce Restructuring and Related Cost, Number of Positions Eliminated, Period Percent Derivative Contract [Domain] Derivative Contract [Domain] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Significant Agreements and Contracts Collaborative Arrangement Disclosure [Text Block] Issuance warrants in connection with the exchange of 2027 Notes Warrants Issued Warrants Issued Total liabilities and stockholders' deficit Liabilities and Equity Shares issuable upon exercise of stock options Stock Options Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Operating lease liabilities Increase (Decrease) In Operating Lease Liabilities Increase decrease in operating lease liabilities. Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name Plan Name [Axis] Interest receivable Interest Receivable, Current Tabular List, Table Tabular List [Table Text Block] Schedule of Stock-Based Compensation Expense Reported in Condensed Consolidated Statements of Operations Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other income (loss), net Other income, net Other Nonoperating Income (Expense) Add back 2030 Notes, as converted (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Tendered percentage Debt Instrument, Convertible, Tendered Percentage Debt Instrument, Convertible, Tendered Percentage Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Sales milestone payments, payable Business Combination, Contingent Consideration Sales Milestone Payments Payable Business combination, contingent consideration, sales milestone payments, payable. Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Offering price (in dollars per share) Sale of Stock, Price Per Share Issuance of common stock and warrants in connection with the exchange of the 2027 Notes, net of issuance costs Stock Issued During Period, Value, Conversion of Convertible Securities Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Options vested and expected to vest as of ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Name Measure Name Accrued consulting fees Accrued Consulting Fees, Current Accrued Consulting Fees, Current Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Schedule of Interest Expense Recognized Schedule Of Interest Expense Recognized Table [Table Text Block] Schedule of interest expense recognized. Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Up-front, nonrefundable payment received Revenue, Performance Obligation, Upfront Nonrefundable Amount Received Revenue, Performance Obligation, Upfront Nonrefundable Amount Received Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental disclosure of cash flow information: Supplemental Cash Flow Elements [Abstract] Name Trading Arrangement, Individual Name Unvested performance stock units granted Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Schedule of Net Carrying Amount of 2027 Notes Schedule Of Notes Table [Table Text Block] Schedule of liability components of notes. Cash and cash equivalents Cash and Cash Equivalent Unpaid debt issuance costs in connection with the exchange of the 2027 Notes Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Restricted stock awards , shares outstanding awarded (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Weighted-Average Remaining Contractual Life (in years), Options vested and expected to vest as of end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Debt Instrument, Covenant Terms [Axis] Debt Instrument, Covenant Terms [Axis] Debt Instrument, Covenant Terms Commercial paper Commercial Paper, Not Included with Cash and Cash Equivalents [Member] Embedded derivative liability Derivative Liability [Member] Derivative Liability Current assets Assets, Current [Abstract] Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Seralutinib Cost of Product and Service Sold Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Stockholders Equity [Table] Stockholders Equity [Table] Stockholders equity . 2026 Option Repricing Under 2019 Plan 2026 Option Repricing Under 2019 Plan [Member] 2026 Option Repricing Under 2019 Plan Research and development Research and Development Expense (Excluding Acquired in Process Cost) Net income (loss) Net loss Segment net gain (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Unamortized debt issuance expense Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Investment in merger option through issuance of stock (in shares) Stock Issued During Period, Shares, Purchase of Assets Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised PAH and PH-ILD Research and Development Services, Performance Obligations Satisfied PAH And PH-ILD Research And Development Services, Performance Obligations Satisfied [Member] PAH And PH-ILD Research And Development Services, Performance Obligations Satisfied Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Interest income Investment Income, Interest Debt conversion, converted instrument, amount Debt Conversion, Converted Instrument, Amount Warrant liability Warrant Liability [Member] Warrant Liability Schedule of Contract Liability Activity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Receivable from contracts with collaborators Increase (Decrease) in Receivables Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Revenue: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]