Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.10.0.1
Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Number of Shares    
Beginning balance - Outstanding (shares) 3,075,994  
Granted (shares) 1,217,935  
Exercised (shares) 0  
Forfeited/Cancelled(shares) (183,821)  
Ending balance - Outstanding (shares) 4,110,108 3,075,994
Exercisable (shares) 2,175,665  
Vested or expected to vest (shares) 4,110,108  
Weighted- Average Exercise Price    
Beginning balance - Outstanding (in dollars per share) $ 5.59  
Granted (in dollars per share) 1.75  
Exercised (in dollars per share) 0  
Forfeited/Cancelled (in dollars per share) 6.66  
Ending balance - Outstanding (in dollars per share) 4.40 $ 5.59
Exercisable (in dollars per share) 5.99  
Vested or expected to vest (in dollars per share) $ 4.40  
Weighted- Average Remaining Contractual Life (in years)    
Balance - Outstanding 7 years 3 months 14 days 7 years 2 months 23 days
Exercisable 5 years 11 months 23 days  
Vested or expected to vest 7 years 3 months 14 days  
Aggregate Intrinsic Value ($000)    
Balance - Outstanding $ 0 $ 151
Exercisable 0  
Vested and expected to vest $ 0