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Stockholder's Deficit - Schedule of Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Class Of Stock [Line Items]    
Shares authorized 84,368,163 84,368,163
Shares outstanding 80,844,138 80,844,138
Liquidation preference $ 213,109 $ 213,109
Series A Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 0.36312 $ 0.36312
Shares authorized 23,020,000 23,020,000
Shares outstanding 23,019,997 23,019,997
Liquidation preference $ 8,359 $ 8,359
Series B Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 0.93808 $ 0.93808
Shares authorized 6,396,071 6,396,071
Shares outstanding 6,396,068 6,396,068
Liquidation preference $ 6,000 $ 6,000
Series C-1 Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 0.54109 $ 0.54109
Shares authorized 9,240,560 9,240,560
Shares outstanding 9,240,558 9,240,558
Liquidation preference $ 5,000 $ 5,000
Series C-2 Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 0.64931 $ 0.64931
Shares authorized 8,950,467 8,950,467
Shares outstanding 7,700,466 7,700,466
Liquidation preference $ 5,000 $ 5,000
Series D Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 2.37840 $ 2.37840
Shares authorized 4,685,755 4,685,755
Shares outstanding 4,204,505 4,204,505
Liquidation preference $ 10,000 $ 10,000
Series E Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 4.35679 $ 4.35679
Shares authorized 11,160,733 11,160,733
Shares outstanding 11,074,655 11,074,655
Liquidation preference $ 48,250 $ 48,250
Series F Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 5.43396 $ 5.43396
Shares authorized 11,041,671 11,041,671
Shares outstanding 11,041,667 11,041,667
Liquidation preference $ 60,000 $ 60,000
Series G Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 7.79730 $ 7.79730
Shares authorized 3,206,239 3,206,239
Shares outstanding 3,206,234 3,206,234
Liquidation preference $ 25,000 $ 25,000
Series H Convertible Preferred Stock    
Class Of Stock [Line Items]    
Price $ 9.17340 $ 9.17340
Shares authorized 6,666,667 6,666,667
Shares outstanding 4,959,988 4,959,988
Liquidation preference $ 45,500 $ 45,500