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Unsecured Convertible Senior Notes - Interest expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
2023 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	$ 1,484	$ 3,281	$ 2,969	$ 6,563
Amortization of debt issuance costs	153	209	303	411
Amortization of debt discount		2,417		4,748
Total	1,637	$ 5,907	3,272	$ 11,722
2026 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	2,954		5,907
Amortization of debt issuance costs	273		519
Total	$ 3,227		$ 6,426

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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