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Equity-Based Compensation - Schedule of Stock Options Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Options    
Shares outstanding, beginning period 3,672,620  
Granted, shares 674,279  
Exercised, shares (8,532)  
Forfeited, shares (2,638)  
Shares outstanding, ending period 4,335,729 3,672,620
Weighted-Average Exercise Price    
Weighted-Average Exercise Price, beginning period (dollars per share) $ 1.79  
Weighted-Average Exercise Price, granted (dollars per share) 3.00  
Weighted-Average Exercise Price, exercised (dollars per share) 0.86  
Weighted-Average Exercise Price, forfeitures (dollars per share) 1.03  
Weighted-Average Exercise Price, ending period (dollars per share) $ 1.98 $ 1.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted-Average Remaining Contractual Term (years) 7 years 6 months 7 years 6 months
Aggregate Intrinsic Value (thousands) $ 5,221 $ 5,221
Exercisable, shares 2,597,078  
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 1.51  
Exercisable, Weighted-Average Remaining Contractual Term 7 years  
Exercisable, Aggregate Intrinsic Value $ 4,245  
Vested and Expected to Vest, shares 3,916,640  
Vested and Expected to Vest, Weighted-Average Exercise Price (dollars per share) $ 2.11  
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term (years) 7 years 6 months  
Vested and Expected to Vest, Aggregate Intrinsic Value (dollars per share) $ 5,190