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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 1,225	$ 1,667	$ 3,615
Amortization of debt discount	0	333	859	999
Amortization of debt issuance costs	0	40	103	120
Total interest expense	0	1,598	2,629	4,734
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	1,278		2,078
Amortization of debt discount	217		341
Amortization of debt issuance costs	172		268
Total interest expense	1,667		2,687
2022 Notes | Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	0	1,446	768	4,337
Amortization of debt discount	0	1,955	1,952	5,866
Amortization of debt issuance costs	0	115	111	344
Total interest expense	$ 0	$ 3,516	$ 2,831	$ 10,547

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

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