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Debt - Convertible Senior Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 12, 2014
Debt Instrument [Line Items]
Interest expense on borrowings	$ 200,000	$ 400,000	$ 1,600,000
2019 Notes
Debt Instrument [Line Items]
Convertible senior notes				$ 230,000,000.0
Interest rate, as a percent				0.75%
Principal amount				$ 230,000,000.0
Debt issuance costs				$ 7,100,000
Interest expense on borrowings	$ 0	$ 363,000	$ 1,578,000

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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