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Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
2025 Notes | Convertible debt
Debt Instrument [Line Items]
Contractual interest expense	$ 5,271	$ 3,434
Amortization of debt discount	829	552
Amortization of debt issuance costs	660	439
Total interest expense	$ 6,760	4,425
2022 Notes | Convertible debt
Debt Instrument [Line Items]
Contractual interest expense		768	$ 5,782
Amortization of debt discount		1,952	7,821
Amortization of debt issuance costs		111	459
Total interest expense		2,831	14,062
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense		1,667	4,789
Amortization of debt discount		859	1,331
Amortization of debt issuance costs		103	161
Total interest expense		$ 2,629	$ 6,281

X

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

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