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Convertible Preferred Stock Warrants - Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Class of Warrant or Right [Line Items]        
Total liability, beginning of period     $ 4,589  
Revaluation of remaining warrants $ 11,226 $ 918 12,419 $ 1,561
Total liability, end of period $ 17,008   $ 17,008  
Warrants to purchase convertible preferred stock        
Class of Warrant or Right [Line Items]        
Total warrants, beginning of period (in shares)     2,019,245  
Revaluation of remaining warrants (in shares)     0  
Total warrants, end of period (in shares) 2,019,245   2,019,245  
Total liability, beginning of period     $ 4,589  
Revaluation of remaining warrants     12,419  
Total liability, end of period $ 17,008   $ 17,008