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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	$ 0
Amortization of debt discount	0
Amortization of issuance costs	650
Total interest expense	650
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	237	$ 249
Amortization of debt discount	0	8,841
Amortization of issuance costs	808	608
Total interest expense	1,045	9,698
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	66	215
Amortization of debt discount	0	3,125
Amortization of issuance costs	168	372
Total interest expense	$ 234	$ 3,712

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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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