Convertible Senior Notes and Capped Calls - Schedule of Interest Expense (Details) - Convertible Debt [Member] - The Notes [Member] - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 719	$ 719
Amortization of debt discount	2,496	2,284
Amortization of issuance costs	247	226
Total interest expense	$ 3,462	$ 3,229

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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