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Convertible Stock and Warrants - Summary of Convertible Preferred Stock (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Temporary Equity [Line Items]    
Shares authorized (in shares) 80,461,609 80,461,609
Shares issued (in shares) 71,740,162 71,740,162
Shares outstanding (in shares) 71,740,162 71,740,162
Carrying value $ 1,465,841 $ 1,465,841
Liquidation preference $ 1,441,757 $ 1,441,757
Convertible preferred stock    
Temporary Equity [Line Items]    
Shares authorized (in shares) 80,461,609  
Shares issued (in shares) 71,740,162  
Shares outstanding (in shares) 71,740,162  
Carrying value $ 1,465,841  
Liquidation preference $ 1,441,757  
Series A preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 9,374,101  
Shares issued (in shares) 9,374,101  
Shares outstanding (in shares) 9,374,101  
Carrying value $ 8,956  
Liquidation preference $ 4,689  
Series B preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 7,868,856  
Shares issued (in shares) 7,868,856  
Shares outstanding (in shares) 7,868,856  
Carrying value $ 11,941  
Liquidation preference $ 11,998  
Series C preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 5,979,069  
Shares issued (in shares) 5,979,069  
Shares outstanding (in shares) 5,979,069  
Carrying value $ 44,928  
Liquidation preference $ 45,000  
Series D preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 6,443,830  
Shares issued (in shares) 6,443,831  
Shares outstanding (in shares) 6,443,831  
Carrying value $ 102,648  
Liquidation preference $ 103,907  
Series E preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 9,486,398  
Shares issued (in shares) 9,486,398  
Shares outstanding (in shares) 9,486,398  
Carrying value $ 198,264  
Liquidation preference $ 167,767  
Series F preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 14,597,248  
Shares issued (in shares) 13,885,893  
Shares outstanding (in shares) 13,885,893  
Carrying value $ 376,962  
Liquidation preference $ 385,750  
Series G preferred    
Temporary Equity [Line Items]    
Shares authorized (in shares) 26,712,107  
Shares issued (in shares) 18,702,014  
Shares outstanding (in shares) 18,702,014  
Carrying value $ 722,142  
Liquidation preference $ 722,646