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Debt Facilities - Summary of Outstanding Principal Amount and Carrying Value (Details) - 2019 Convertible Senior Notes due 2026 - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding principal amount	$ 86,250	$ 86,250
Unamortized debt discount and debt issuance costs	(2,110)	(31,694)
Carrying value	$ 84,140	$ 54,556

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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