Quarterly report pursuant to Section 13 or 15(d)

Redeemable Convertible Preferred Stock - Schedule of Changes in the Preferred Stock (Detail)

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Redeemable Convertible Preferred Stock - Schedule of Changes in the Preferred Stock (Detail)
9 Months Ended
Sep. 30, 2017
USD ($)
Temporary Equity [Line Items]  
Balance at December 31, 2016 $ 25,871,325
Deemed dividends on preferred stock 958,300
Conversion to common stock in merger (26,829,625)
Balance at September 30, 2017 0
Series A Preferred  
Temporary Equity [Line Items]  
Balance at December 31, 2016 3,889,257
Deemed dividends on preferred stock 119,406
Conversion to common stock in merger (4,008,663)
Balance at September 30, 2017 0
Series B Preferred  
Temporary Equity [Line Items]  
Balance at December 31, 2016 5,480,130
Deemed dividends on preferred stock 178,129
Conversion to common stock in merger (5,658,259)
Balance at September 30, 2017 0
Series C Preferred  
Temporary Equity [Line Items]  
Balance at December 31, 2016 16,501,938
Deemed dividends on preferred stock 660,765
Conversion to common stock in merger (17,162,703)
Balance at September 30, 2017 $ 0