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Debt - Components of Convertible Senior Notes (Details) - Convertible Senior Notes - Convertible Senior Notes - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Principal amount outstanding $ 6,761 $ 13,131
Unamortized discount of liability component (57) (415)
Unamortized debt issuance costs (8) (55)
Net carrying amount of liability component 6,696 12,661
Carrying value of equity component, net of issuance costs 1,166 2,265
Fair value of outstanding Convertible Senior Notes $ 41,570 $ 30,991
Remaining amortization period of discount on the liability component 3 months 18 days 1 year