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Debt - Interest Income and Interest Expense Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Total interest expense	$ 5,469	$ 1,831
2026 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	250	96
Amortization of debt discount	4,510	1,629
Amortization of debt issuance costs	296	106
Total interest expense	5,056	1,831
2028 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	52	0
Amortization of debt discount	333	0
Amortization of debt issuance costs	28	0
Total interest expense	$ 413	$ 0

X

- 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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- Definition

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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