XML 46 R54.htm IDEA: XBRL DOCUMENT v3.19.3
Convertible Preferred Stock Warrants - General Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Class of Warrant or Right [Line Items]    
Convertible preferred stock warrant liability $ 17,008 $ 4,589
Warrants to purchase convertible preferred stock    
Class of Warrant or Right [Line Items]    
Shares issued upon exercise of warrants (in shares) 2,019,245 2,019,245
Exercise price (in dollars per share) $ 1.73 $ 1.73
Convertible preferred stock warrant liability $ 17,008 $ 4,589