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Stock-Based Compensation - Summary of Stock Option Activity (Details) - 2002 Plan - 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 Options, Outstanding - Beginning balance 1,075,209  
Number of Options, Granted 260,301  
Number of Options, Exercised (19,885)  
Number of Options, Outstanding - Ending balance 1,315,625 1,075,209
Number of Options, Vested and expected to vest at September 30, 2018 1,217,885  
Number of Options, Vested and exercisable at September 30, 2018 807,177  
Weighted- Average Exercise Price, Beginning balance $ 1.60  
Weighted- Average Exercise Price, Granted 3.40  
Weighted- Average Exercise Price, Exercised 2.68  
Weighted- Average Exercise Price, Ending balance 1.94 $ 1.60
Weighted- Average Exercise Price, Vested and expected to vest at September 30, 2018 1.90  
Weighted- Average Exercise Price, Vested and exercisable at September 30, 2018 $ 1.60  
Weighted- Average Remaining Contractual Term, Balance 7 years 2 months 12 days 7 years 3 months 18 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest at September 30, 2018 7 years 1 month 6 days  
Weighted- Average Remaining Contractual Term, Vested and exercisable at September 30, 2018 6 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 8,105,669 $ 711,328
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2018 7,553,919  
Aggregate Intrinsic Value, Vested and exercisable at September 30, 2018 $ 5,243,664