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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Cash withdrawn from reserve account							$ 5,000,000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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