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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 1,446	$ 1,446
Amortization of debt discount	1,956	1,956
Amortization of debt issuance costs	114	114
Total interest expense	3,516	3,516
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense	1,180	1,094
Amortization of debt discount	333	333
Amortization of debt issuance costs	40	40
Total interest expense	$ 1,553	$ 1,467

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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