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Unsecured Convertible Senior Notes - Interest expense recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2023 Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	$ 10,410	$ 13,089	$ 1,677
Amortization of debt issuance costs	669	8,496	996
Amortization of debt discount	7,728	736	86
Total	18,807	$ 22,321	$ 2,759
2026 Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	4,397
Amortization of debt issuance costs	230
Amortization of debt discount	3,022
Total	$ 7,649

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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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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