Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.19.3
Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Number of Shares    
Beginning balance - Outstanding (shares) | shares 4,052,913  
Granted (shares) | shares 1,629,500  
Exercised (shares) | shares (22,500)  
Forfeited/Cancelled(shares) | shares (470,053)  
Ending balance - Outstanding (shares) | shares 5,189,860 4,052,913
Exercisable (shares) | shares 2,761,275  
Vested or expected to vest (shares) | shares 5,189,860  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) | $ / shares $ 4.37  
Granted (in dollars per share) | $ / shares 1.26  
Exercised (in dollars per share) | $ / shares 0.54  
Forfeited/Cancelled (in dollars per share) | $ / shares 7.96  
Ending balance - Outstanding (in dollars per share) | $ / shares 3.09 $ 4.37
Exercisable (in dollars per share) | $ / shares 4.32  
Vested or expected to vest (in dollars per share) | $ / shares $ 3.09  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 7 years 10 months 2 days 7 years 2 months 23 days
Exercisable 6 years 11 months 26 days  
Vested or expected to vest 7 years 10 months 2 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding | $ $ 75 $ 0
Exercisable | $ 47  
Vested and expected to vest | $ $ 75