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Redeemable Convertible Preferred Stock and Stockholders' Deficit - Summary of Authorized, Issued, and Outstanding Shares of Preferred Stock and Carrying Amounts and Liquidation Values (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Temporary Equity [Line Items]    
Shares Authorized 0 13,321,350
Shares Issued 0 9,131,999
Shares Outstanding 0 9,131,999
Carrying Amount   $ 89,633,543
Liquidation Value   $ 89,776,055
Series 1    
Temporary Equity [Line Items]    
Shares Authorized   132,255
Shares Issued   132,255
Shares Outstanding   132,255
Carrying Amount   $ 522,266
Liquidation Value   $ 526,778
Series 2    
Temporary Equity [Line Items]    
Shares Authorized   1
Shares Issued   1
Shares Outstanding   1
Carrying Amount   $ 240,242
Liquidation Value   $ 250,000
Series AA    
Temporary Equity [Line Items]    
Shares Authorized   575,470
Shares Issued   573,961
Shares Outstanding   573,961
Carrying Amount   $ 7,615,583
Liquidation Value   $ 7,619,998
Series B    
Temporary Equity [Line Items]    
Shares Authorized   6,382,259
Shares Issued   6,251,502
Shares Outstanding   6,251,502
Carrying Amount   $ 60,366,480
Liquidation Value   $ 60,379,282
Series C-1    
Temporary Equity [Line Items]    
Shares Authorized   4,524,375
Shares Issued   2,174,280
Shares Outstanding   2,174,280
Carrying Amount   $ 20,888,972
Liquidation Value   $ 20,999,997
Series C-2    
Temporary Equity [Line Items]    
Shares Authorized   916,095
Series C-3    
Temporary Equity [Line Items]    
Shares Authorized   790,895