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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 249	$ 14
Amortization of debt discount	8,841	510
Amortization of issuance costs	608	35
Total interest expense	9,698	559
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	215	213
Amortization of debt discount	3,125	3,091
Amortization of issuance costs	372	369
Total interest expense	$ 3,712	$ 3,673

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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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