Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Based Compensation - Options (Details)

v3.8.0.1
Stockholders' Equity and Stock Based Compensation - Options (Details) - 2006 Plan and 2012 Plan - Options - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Number of Options    
Outstanding at the beginning of the period (in shares) 50,640  
Canceled (in shares) 6,000  
Exercised (in shares) 44,640  
Outstanding at the end of the period (in shares)    
Exercisable at the end of the period (in shares) 0 0
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 12.85  
Canceled (in dollars per share) 12.85  
Exercised (in dollars per share) $ 12.850  
Outstanding at the end of the period (in dollars per share)    
Aggregate Intrinsic Value    
Options reserved for future issuance (in shares)   0