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Debt - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 24, 2019 | Jul. 12, 2018 | Sep. 02, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of priority review voucher | $ 78,300,000 |  |  |  |  |  |  |
Fair value of warrant |  | $ 6,433,427 | $ 6,433,427 |  | $ 12,380,939 |  |  |
London Interbank Offered Rate (LIBOR) | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin for term loan |  |  | 11.50% |  |  |  |  |
Effective interest rate (as a percent) |  |  | 19.19% |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value of warrant |  | 6,400,000 | $ 6,400,000 |  |  |  |  | $ 5,800,000
Secured Debt | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility |  | 80,000,000 | 80,000,000 |  |  |  |  | 80,000,000
Additional borrowing capacity |  | 5,000,000 | 5,000,000 |  |  |  |  |
Interest expense, debt |  | 4,000,000 |  |  |  |  |  |
Interest expense accreted to balance |  | 1,100,000 |  |  |  |  |  |
Cash withdrawn from reserve account |  |  |  |  |  |  | $ 5,000,000 |
Restricted cash |  |  |  |  |  | $ 100,500,000 |  |
Fees and expenses |  | 4,000,000 | $ 4,000,000 |  |  |  |  |
Potential increase in interest rate |  |  | 2.00% |  |  |  |  |
Minimum cash requirement |  |  |  |  | $ 5,000,000 |  |  |
Costs incurred |  |  |  |  |  |  |  | $ 8,200,000
Secured Debt | US Treasury Rate | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin for term loan |  |  | 0.50% |  |  |  |  |
Secured Debt | Repayment of Interests | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capacity available for specific purpose other than for trade purchases |  | 25,000,000 | $ 25,000,000 |  |  |  |  |
Secured Debt | Payments Related to Litigation | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capacity available for specific purpose other than for trade purchases |  | $ 50,000,000 | $ 50,000,000 |  |  |  |  |
Forecast | Secured Debt | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Minimum cash requirement |  |  |  | $ 20,000,000 |  |  |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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