Debt - Convertible Senior Notes - Interest and Amortization Expense (Details) - Convertible senior notes - 2025 Notes - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest expense
Contractual interest expense	$ 1,203	$ 1,203	$ 2,406	$ 2,406
Amortization of debt issuance costs	149	136	294	269
Amortization of debt discount	1,786	1,635	3,535	3,236
Total interest and amortization expense	$ 3,138	$ 2,974	$ 6,235	$ 5,911

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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