Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.19.2
Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of Shares    
Beginning balance - Outstanding (shares) 4,052,913  
Granted (shares) 1,614,500  
Exercised (shares) 0  
Forfeited/Cancelled(shares) (88,435)  
Ending balance - Outstanding (shares) 5,578,978 4,052,913
Exercisable (shares) 2,928,163  
Vested or expected to vest (shares) 5,578,978  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) $ 4.37  
Granted (in dollars per share) 1.26  
Exercised (in dollars per share) 0  
Forfeited/Cancelled (in dollars per share) 6.80  
Ending balance - Outstanding (in dollars per share) 3.43 $ 4.37
Exercisable (in dollars per share) 4.96  
Vested or expected to vest (in dollars per share) $ 3.43  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 7 years 7 months 17 days 7 years 2 months 23 days
Exercisable 6 years 4 months 24 days  
Vested or expected to vest 7 years 7 months 17 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding $ 169 $ 0
Exercisable 89  
Vested and expected to vest $ 169