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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 516	$ 0	$ 1,667
Amortization of debt discount	0	526	0	859
Amortization of debt issuance costs	0	63	0	103
Total interest expense	0	1,105	0	2,629
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	1,315	800	2,584	800
Amortization of debt discount	207	124	415	124
Amortization of debt issuance costs	165	96	330	96
Total interest expense	1,687	1,020	3,329	1,020
2022 Notes | Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	0	286	0	768
Amortization of debt discount	0	700	0	1,952
Amortization of debt issuance costs	0	39	0	111
Total interest expense	$ 0	$ 1,025	$ 0	$ 2,831

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- 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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