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Debt - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Jul. 12, 2018	Dec. 31, 2017	Sep. 02, 2016
Debt Instrument [Line Items]
Fair value of warrant	$ 14,408,991	$ 14,408,991				$ 11,466,162
London Interbank Offered Rate (LIBOR) | Loan Agreement
Debt Instrument [Line Items]
Margin for term loan		11.50%
Effective interest rate (as a percent)		19.10%
Warrants
Debt Instrument [Line Items]
Fair value of warrant	14,400,000	$ 14,400,000					$ 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	3,800,000	7,600,000
Interest paid on term loan	2,700,000	5,400,000
Interest expense accreted to balance	1,100,000	2,200,000
Fees and expenses	4,000,000	$ 4,000,000
Potential increase in interest rate		2.00%
Costs incurred							$ 8,200,000
Remaining borrowing capacity	73,300,000	$ 73,300,000
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
Subsequent Event | Secured Debt | Loan Agreement
Debt Instrument [Line Items]
Cash withdrawn from reserve account					$ 5,000,000
Forecast | Secured Debt | Loan Agreement
Debt Instrument [Line Items]
Minimum cash requirement			$ 20,000,000	$ 5,000,000

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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