Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Details)

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Stockholders' Equity - Summary of Stock Option Activity (Details) - Stock Options - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, Outstanding beginning balance 2,379,444  
Number of Shares, Granted 113,000  
Number of Shares, Forfeited / Cancelled (194,582)  
Number of Shares, Exercised (428,954)  
Number of Shares, Outstanding ending balance 1,868,908 2,379,444
Number of Shares, Exercisable ending balance 1,509,618  
Number of Shares, Vested and expected to vest ending balance 1,858,687  
Weighted Average Exercise Price, Outstanding beginning balance $ 1.00  
Weighted Average Exercise Price, Granted 3.84  
Weighted Average Exercise Price, Forfeited / Cancelled 0.88  
Weighted Average Exercise Price, Exercised 0.86  
Weighted Average Exercise Price, Outstanding ending balance 1.21 $ 1.00
Weighted Average Exercise Price, Exercisable ending balance 0.92  
Weighted Average Exercise Price, Vested and expected to vest ending balance $ 1.20  
Weighted Average Remaining Contractual Life (in years), Outstanding balance 5 years 6 months 21 days 5 years 3 months 18 days
Weighted Average Remaining Contractual Life (in years), Exercisable balance 4 years 9 months 7 days  
Weighted Average Remaining Contractual Life (in years), Vested and expected to vest balance 5 years 6 months 14 days  
Aggregate Intrinsic Value, Outstanding balance $ 4,703,975 $ 15,472,456
Aggregate Intrinsic Value, Exercisable balance 4,228,179  
Aggregate Intrinsic Value, Vested and expected to vest balance $ 4,694,024