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Convertible Preferred Stock - Tabular Disclosure (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]            
Convertible preferred stock, shares authorized (in shares) 314,930,070   314,930,070      
Convertible preferred stock, shares issued (in shares) 65,428,088 65,428,088 65,428,088 65,428,088 65,428,088 66,630,284
Convertible preferred stock, shares outstanding (in shares) 65,428,088   65,428,088      
Convertible preferred stock, aggregate liquidation preference $ 106,369   $ 106,369      
Series A Preferred Stock            
Class of Stock [Line Items]            
Convertible preferred stock, shares authorized (in shares) 69,930,070   69,930,070      
Convertible preferred stock, shares issued (in shares) 15,384,798   15,384,798      
Convertible preferred stock, shares outstanding (in shares) 15,384,798   15,384,798      
Convertible preferred stock, aggregate liquidation preference $ 20,000   $ 20,000      
Series B Preferred Stock            
Class of Stock [Line Items]            
Convertible preferred stock, shares authorized (in shares) 245,000,000   245,000,000      
Convertible preferred stock, shares issued (in shares) 50,043,290   50,043,290      
Convertible preferred stock, shares outstanding (in shares) 50,043,290   50,043,290      
Convertible preferred stock, aggregate liquidation preference $ 86,369   $ 86,369