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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	$ 0		$ 0
Amortization of debt discount	0		0
Amortization of issuance costs	657		1,307
Total interest expense	657		1,307
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	218	$ 249	455	$ 498
Amortization of debt discount	0	8,842	0	17,683
Amortization of issuance costs	740	607	1,548	1,215
Total interest expense	958	9,698	2,003	19,396
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	12	215	78	430
Amortization of debt discount	0	3,126	0	6,251
Amortization of issuance costs	74	371	242	743
Total interest expense	$ 86	$ 3,712	$ 320	$ 7,424

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