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Unsecured Convertible Senior Notes - Unsecured convertible senior notes outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Aug. 14, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 320,030
Unamortized discount	(77,645)
Unamortized issuance costs attributable to principal amount	(6,097)
Total Convertible Senior Notes, net	236,288
2023 Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount	95,000	$ 95,000	$ 210,000
Unamortized discount	(17,101)		(47,660)
Unamortized issuance costs attributable to principal amount	(1,481)		(4,127)
Total Convertible Senior Notes, net	76,418		158,213
Fair value of outstanding Convertible Senior Notes (2)	101,769		208,163
Amount by which the Convertible Senior Notes if-converted value exceeds their principal amount	6,769
Equity component	25,854		57,152
Issuance costs	(837)		(1,851)
Net carrying amount of equity component (1)	25,017		$ 55,301
2026 Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount	225,030
Unamortized discount	(60,544)
Unamortized issuance costs attributable to principal amount	(4,616)
Total Convertible Senior Notes, net	159,870
Fair value of outstanding Convertible Senior Notes (2)	246,779
Amount by which the Convertible Senior Notes if-converted value exceeds their principal amount	21,749
Equity component	63,544
Issuance costs	(1,916)
Net carrying amount of equity component (1)	$ 61,628

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion before deducting the unamortized debt issuance costs.

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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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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Amount, after accumulated amortization, of debt discount.

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