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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	$ 0		$ 0
Amortization of debt discount	4,491		4,491
Amortization of issuance costs	225		225
Total interest expense	4,716		4,716
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	252	$ 252	750	$ 517
Amortization of debt discount	8,938	8,939	26,621	18,363
Amortization of issuance costs	614	614	1,829	1,262
Total interest expense	9,804	9,805	29,200	20,142
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	169	217	599	645
Amortization of debt discount	2,458	3,161	8,709	9,377
Amortization of issuance costs	292	375	1,035	1,112
Total interest expense	$ 2,919	$ 3,753	$ 10,343	$ 11,134

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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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