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Equity-Based Compensation - Schedule of Stock Options Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Options      
Shares outstanding, beginning period 3,089,352    
Granted, shares 657,843    
Exercised, shares (58,440)    
Forfeited, shares (10,396)    
Shares outstanding, ending period 3,678,359 3,089,352  
Weighted-Average Exercise Price      
Weighted-Average Exercise Price, beginning period (dollars per share) $ 1.25    
Weighted-Average Exercise Price, granted (dollars per share) 4.21    
Weighted-Average Exercise Price, exercised (dollars per share) 0.75    
Weighted-Average Exercise Price, forfeitures (dollars per share) 1.00    
Weighted-Average Exercise Price, ending period (dollars per share) $ 1.79 $ 1.25  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted-Average Remaining Contractual Term (years) 7 years 9 months 18 days 8 years 2 months 12 days  
Aggregate Intrinsic Value (thousands) $ 5,257 $ 9,143  
Exercisable, shares 2,131,730    
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 1.37    
Exercisable, Weighted-Average Remaining Contractual Term 7 years 4 months 24 days    
Exercisable, Aggregate Intrinsic Value $ 3,704    
Vested and Expected to Vest, shares 3,595,855    
Vested and Expected to Vest, Weighted-Average Exercise Price (dollars per share) $ 1.77    
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term (years) 7 years 8 months 12 days    
Vested and Expected to Vest, Aggregate Intrinsic Value (dollars per share) $ 5,195    
Scenario, Previously Reported      
Options      
Shares outstanding, beginning period 6,222,448 6,528,052 2,954,418
Granted, shares   175,000 3,941,134
Exercised, shares   (98,283) (166,875)
Forfeited, shares   (382,321) (200,625)
Shares outstanding, ending period   6,222,448 6,528,052
Weighted-Average Exercise Price      
Weighted-Average Exercise Price, beginning period (dollars per share) $ 0.62 $ 0.59 $ 0.32
Weighted-Average Exercise Price, granted (dollars per share)   1.14 0.76
Weighted-Average Exercise Price, exercised (dollars per share)   0.33 0.32
Weighted-Average Exercise Price, forfeitures (dollars per share)   0.33 0.35
Weighted-Average Exercise Price, ending period (dollars per share)   $ 0.62 $ 0.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted-Average Remaining Contractual Term (years)   8 years 2 months 12 days 9 years 1 month 6 days
Aggregate Intrinsic Value (thousands)   $ 9,143 $ 2,310
Exercisable, shares   2,956,455  
Exercisable, Weighted-Average Exercise Price (dollars per share)   $ 0.51  
Exercisable, Weighted-Average Remaining Contractual Term   7 years 9 months 18 days  
Exercisable, Aggregate Intrinsic Value   $ 4,683  
Vested and Expected to Vest, shares   6,025,583  
Vested and Expected to Vest, Weighted-Average Exercise Price (dollars per share)   $ 0.61  
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term (years)   8 years 1 month 6 days  
Vested and Expected to Vest, Aggregate Intrinsic Value (dollars per share)   $ 8,888