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Convertible Preferred Stock - Convertible Preferred Stock Issued and Outstanding (Detail) - Preferred Stock - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Jun. 30, 2019
Dec. 31, 2018
Temporary Equity [Line Items]      
Shares Designated (in shares) 57,501,624 5,000,000 5,000,000
Original Issue Price (in dollars per share)   $ 0.0001 $ 0.0001
Shares Issued (in shares) 40,016,147    
Shares Outstanding (in shares) 40,016,147    
Aggregate Liquidation Amount $ 208,315    
Proceeds, Net of Issuance Costs $ 161,054    
Series A      
Temporary Equity [Line Items]      
Shares Designated (in shares) 12,768,492    
Original Issue Price (in dollars per share) $ 1.9579445    
Shares Issued (in shares) 12,618,279    
Shares Outstanding (in shares) 12,618,279    
Common Stock Equivalents (in shares) 12,618,279    
Aggregate Liquidation Amount $ 24,706    
Proceeds, Net of Issuance Costs $ 23,848    
Series B      
Temporary Equity [Line Items]      
Shares Designated (in shares) 31,034,696    
Original Issue Price (in dollars per share) $ 3.2222    
Shares Issued (in shares) 13,801,318    
Shares Outstanding (in shares) 13,801,318    
Common Stock Equivalents (in shares) 13,801,318    
Aggregate Liquidation Amount $ 44,471    
Proceeds, Net of Issuance Costs $ 43,616    
Series C-1      
Temporary Equity [Line Items]      
Shares Designated (in shares) 8,660,572    
Original Issue Price (in dollars per share) $ 3.97    
Shares Issued (in shares) 8,558,686    
Shares Outstanding (in shares) 8,558,686    
Common Stock Equivalents (in shares) 8,558,686    
Aggregate Liquidation Amount $ 33,978    
Proceeds, Net of Issuance Costs $ 34,382    
Series C      
Temporary Equity [Line Items]      
Shares Designated (in shares) 5,037,784    
Original Issue Price (in dollars per share) $ 3.97    
Shares Issued (in shares) 5,037,784    
Shares Outstanding (in shares) 5,037,784    
Common Stock Equivalents (in shares) 5,037,784    
Aggregate Liquidation Amount $ 20,000    
Proceeds, Net of Issuance Costs $ 19,469    
Series D      
Temporary Equity [Line Items]      
Shares Designated (in shares) 80    
Original Issue Price (in dollars per share) $ 500,000    
Shares Issued (in shares) 80    
Shares Outstanding (in shares) 80    
Aggregate Liquidation Amount $ 85,160    
Proceeds, Net of Issuance Costs $ 39,739