Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Stockholders' Equity - Summary of Stock Option Activity (Details) - Stock Options - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, Outstanding beginning balance 1,968,747  
Number of Shares, Granted 106,000  
Number of Shares, Forfeited / Cancelled (62,000)  
Number of Shares, Exercised (356,669)  
Number of Shares, Outstanding ending balance 1,656,078 1,968,747
Number of Shares, Exercisable ending balance 1,437,732  
Number of Shares, Vested and expected to vest ending balance 1,650,992  
Weighted Average Exercise Price, Outstanding beginning balance $ 1.14  
Weighted Average Exercise Price, Granted 2.14  
Weighted Average Exercise Price, Forfeited / Cancelled 2.04  
Weighted Average Exercise Price, Exercised 0.41  
Weighted Average Exercise Price, Outstanding ending balance 1.33 $ 1.14
Weighted Average Exercise Price, Exercisable ending balance 1.12  
Weighted Average Exercise Price, Vested and expected to vest ending balance $ 1.32  
Weighted Average Remaining Contractual Life (in years), Outstanding balance   4 years 6 months 21 days
Weighted Average Remaining Contractual Life (in years), Granted 5 years 3 months  
Weighted Average Remaining Contractual Life (in years), Forfeited / Cancelled 7 years 4 months 6 days  
Weighted Average Remaining Contractual Life (in years), Exercised 4 months 6 days  
Weighted Average Remaining Contractual Life (in years), Outstanding balance 5 years 1 month 28 days  
Weighted Average Remaining Contractual Life (in years), Exercisable balance 4 years 7 months 24 days  
Weighted Average Remaining Contractual Life (in years), Vested and expected to vest balance 5 years 1 month 20 days  
Aggregate Intrinsic Value, Outstanding balance $ 2,779,300 $ 1,469,525
Aggregate Intrinsic Value, Granted balance 85,390  
Aggregate Intrinsic Value, Forfeited / Cancelled balance 57,000  
Aggregate Intrinsic Value, Exercised balance 905,523  
Aggregate Intrinsic Value, Exercisable balance 2,663,880  
Aggregate Intrinsic Value, Vested and expected to vest balance $ 2,777,298