Annual report pursuant to Section 13 and 15(d)

Stock Option Plan - Summary of Stock Option Activity and Related Information (Details)

v3.7.0.1
Stock Option Plan - Summary of Stock Option Activity and Related Information (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options      
Exercised (in shares) (10,352) (265,484)  
2013 Equity Incentive Plan      
Stock Options      
Outstanding at January 1 (in shares) 1,332,323 1,368,047  
Granted (in shares) 96,138 221,102  
Exercised (in shares) (4,607) (201,389)  
Forfeited/Expired/Exchanged (in shares) (38,650) (55,437)  
Outstanding at December 31 (in shares) 1,385,204 1,332,323 1,368,047
Exercisable at December 31 (in shares) 862,354 572,623  
Weighted Average Exercise Price      
Outstanding at January 1 (in dollars per share) $ 6.94 $ 6.41  
Granted (in dollars per share) 5.95 7.80  
Exercised (in dollars per share) 5.00 4.47  
Forfeited/Expired/Exchanged (in dollars per share) 6.68 6.13  
Outstanding at December 31 (in dollars per share) 6.89 6.94 $ 6.41
Exercisable at December 31 (in dollars per share) $ 6.56 $ 6.02  
Weighted Average Remaining Life (in years)      
Outstanding (in years) 7 years 6 months 8 years 4 months 24 days 8 years 8 months 12 days
Exercisable at December 31 (in years) 7 years 2 months 12 days 7 years 9 months 18 days