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Debt - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 02, 2016
Debt Instrument [Line Items]
Fair value of warrant	$ 14,769,276				$ 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)	18.96%
Warrants
Debt Instrument [Line Items]
Fair value of warrant	$ 14,800,000					$ 5,800,000
Secured Debt | Loan Agreement
Debt Instrument [Line Items]
Line of credit facility	80,000,000					80,000,000
Interest expense, debt	3,700,000
Interest paid on term loan	2,600,000
Interest expense accreted to balance	$ 1,100,000
Potential increase in interest rate	2.00%
Costs incurred						$ 8,200,000
Fees and expenses	$ 4,000,000
Remaining borrowing capacity	$ 72,200,000
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
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
Secured Debt | Forecast | Loan Agreement
Debt Instrument [Line Items]
Additional borrowing capacity				$ 5,000,000
Minimum cash requirement		$ 20,000,000	$ 5,000,000

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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The average effective interest rate during the reporting period.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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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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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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