Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

v3.8.0.1
Stockholder's Equity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding beginning (in shares) | shares 1,803,094
Granted (in shares) | shares 94,000
Exercised (in shares) | shares (896)
Forfeited/canceled (in shares) | shares (8,968)
Outstanding ending (in shares) | shares 1,887,230
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Outstanding beginning (in dollars per share) $ 4.41
Granted (in dollars per share) 4.58
Exercised (in dollars per share) 2.52
Forfeited/canceled (in dollars per share) 4.30
Outstanding ending (in dollars per share) $ 4.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Life [Roll Forward]  
Outstanding beginning (in years) 9 years 2 months 8 days
Outstanding ending (in years) 9 years 14 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]  
Outstanding beginning | $ $ 334
Granted
Exercised | $ $ 2
Outstanding ending | $ $ 330