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Net Income (Loss) Per Share - Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of net loss attributable to common stockholders for basic and diluted net loss per share        
Net income (loss) attributable to common stockholders, basic $ 2,657 $ (11,944) $ (2,703)  
Interest expense on 2026 Convertible Note 1,113 1,069 3,286  
Change in fair value of derivative liability (23,837) (3,771) (62,249)  
Net loss attributable to common stockholders, diluted $ (20,067) $ (14,646) $ (61,666)  
Weighted average common shares outstanding, basic 76,552,060 62,992,558 76,317,563 57,440,885
Dilutive options (treasury stock method) 3,125,594      
Shares issuable upon conversion of 2026 Convertible Note, as if converted 5,769,232 5,769,232 5,769,232  
Weighted average common shares outstanding, diluted 85,446,886 68,761,790 82,086,795 57,440,885
Net loss per share attributable to common stockholders diluted $ (0.23) $ (0.21) $ (0.75) $ (1.22)