Convertible Senior Notes and Capped Calls - Schedule of Interest Expense (Details) - Convertible Debt [Member] - The Notes [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 718	$ 1,437
Amortization of debt discount	2,361	4,645
Amortization of issuance costs	233	459
Total interest expense	$ 3,312	$ 6,541

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

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