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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Contractual interest expense	$ 1,975	$ 1,970	$ 3,948	$ 3,941
Amortization of debt issuance costs	349	349	698	698
Accretion of debt discount	4,713	4,466	9,363	8,872
Total convertible debt interest expense	7,037	6,785	14,009	13,511
Finance lease interest expense	432	0	871	0
Total interest expense	$ 7,469	$ 6,785	$ 14,880	$ 13,511

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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 interest expense on finance lease liability.

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