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Debt - Interest Income and Interest Expense Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Total interest expense	$ 7,730	$ 4,821	$ 20,820	$ 11,443
2026 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	250	246	750	591
Amortization of debt discount	4,664	4,292	13,761	10,183
Amortization of debt issuance costs	306	283	903	669
Total interest expense	5,220	4,821	15,414	11,443
2028 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	313	0	678	0
Amortization of debt discount	2,029	0	4,366	0
Amortization of debt issuance costs	168	0	362	0
Total interest expense	$ 2,510	$ 0	$ 5,406	$ 0

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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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