Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Option Activity (Details)

v3.8.0.1
Stock-Based Compensation - Summary of Option Activity (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Number of shares  
Balance, beginning of period (in shares) | shares 1,849,359
Granted (in shares) | shares 578,611
Forfeited (in shares) | shares (18,391)
Balance, end of period (in shares) | shares 2,409,579
Exercisable (in shares) | shares 1,467,463
Weighted‑average exercise price  
Beginning of period (usd per share) | $ / shares $ 5.57
Granted (usd per share) | $ / shares 0.74
Forfeited (usd per share) | $ / shares 5.63
End of period (usd per share) | $ / shares 4.41
Exercisable (usd per share) | $ / shares $ 5.25
Fair value of options granted  
Granted | $ $ 301,743
Weighted average remaining contractual term (in years)  
Balance, end of period 8 years 1 month 13 days
Exercisable 7 years 7 months 24 days