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Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2020
Long-term debt
Amortization of debt issuance costs	$ 1,848	$ 1,020	$ 694
Effective interest rate of the liability component	10.90%			11.00%
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Contractual interest expense	$ 4,500	4,500
Amortization of debt issuance costs	720	464
Amortization of debt discount		9,314
Total	$ 5,220	$ 14,278
Effective interest rate of the liability component	3.50%	11.00%
Convertible debt | 1.50% Convertible senior notes due 2026
Long-term debt
Contractual interest expense	$ 4,313	$ 4,319
Amortization of debt issuance costs	1,128	508
Amortization of debt discount		13,285
Total	$ 5,441	$ 18,112
Effective interest rate of the liability component	1.90%	10.20%

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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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