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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 ($)
Sep. 30, 2018
Aug. 31, 2018
Dec. 31, 2017
Temporary Equity [Line Items]      
Shares Authorized 18,292,696   13,321,350
Shares Issued 13,200,115   9,131,999
Shares Outstanding 13,200,115   9,131,999
Carrying Amount $ 125,609,295   $ 89,633,543
Liquidation Value $ 129,071,361   $ 89,776,055
Series 1      
Temporary Equity [Line Items]      
Shares Authorized 132,255   132,255
Shares Issued 132,255   132,255
Shares Outstanding 132,255   132,255
Carrying Amount $ 523,838   $ 522,266
Liquidation Value $ 526,778   $ 526,778
Series 2      
Temporary Equity [Line Items]      
Shares Authorized 1   1
Shares Issued 1   1
Shares Outstanding 1   1
Carrying Amount $ 243,640   $ 240,242
Liquidation Value $ 250,000   $ 250,000
Series AA      
Temporary Equity [Line Items]      
Shares Authorized 575,470   575,470
Shares Issued 573,961   573,961
Shares Outstanding 573,961   573,961
Carrying Amount $ 7,617,120   $ 7,615,583
Liquidation Value $ 7,619,998   $ 7,619,998
Series B      
Temporary Equity [Line Items]      
Shares Authorized 6,382,259   6,382,259
Shares Issued 6,251,502   6,251,502
Shares Outstanding 6,251,502   6,251,502
Carrying Amount $ 60,371,358   $ 60,366,480
Liquidation Value $ 60,379,282   $ 60,379,282
Series C-1      
Temporary Equity [Line Items]      
Shares Authorized 4,524,375   4,524,375
Shares Issued 2,319,228   2,174,280
Shares Outstanding 2,319,228   2,174,280
Carrying Amount $ 22,140,786   $ 20,888,972
Liquidation Value $ 22,401,423   $ 20,999,997
Series C-2      
Temporary Equity [Line Items]      
Shares Authorized 916,095   916,095
Series C-3      
Temporary Equity [Line Items]      
Shares Authorized 790,895   790,895
Series D      
Temporary Equity [Line Items]      
Shares Authorized 4,971,346    
Shares Issued 3,923,168 1,842,959  
Shares Outstanding 3,923,168    
Carrying Amount $ 34,712,552    
Liquidation Value $ 37,893,880