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Common Stock, Redeemable Common Stock, and Convertible Preferred Stock - Convertible Preferred Stock (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Temporary Equity [Line Items]  
Preferred Stock Designated 49,413,523
Preferred Stock Issued 40,079,567
Preferred Stock Outstanding 40,079,567
Carrying Value | $ $ 64,675
Liquidation Preference | $ $ 84,067
Common Stock Issuable Upon Conversion 3,808,430
Series Seed Preferred Stock [Member]  
Temporary Equity [Line Items]  
Preferred Stock Designated 2,313,523
Preferred Stock Issued 1,516,136
Preferred Stock Outstanding 1,516,136
Carrying Value | $ $ 1,310
Liquidation Preference | $ $ 1,444
Common Stock Issuable Upon Conversion 143,630
Series A Preferred Stock  
Temporary Equity [Line Items]  
Preferred Stock Designated 22,000,000
Preferred Stock Issued 19,946,862
Preferred Stock Outstanding 19,946,862
Carrying Value | $ $ 32,480
Liquidation Preference | $ $ 47,624
Common Stock Issuable Upon Conversion 1,895,610
Series B Preferred Stock  
Temporary Equity [Line Items]  
Preferred Stock Designated 25,100,000
Preferred Stock Issued 18,616,569
Preferred Stock Outstanding 18,616,569
Carrying Value | $ $ 30,885
Liquidation Preference | $ $ 34,999
Common Stock Issuable Upon Conversion 1,769,190