Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Stockholders' Equity and Stock Based Compensation - Plans (Details)
12 Months Ended
Dec. 31, 2017
installment
shares
Dec. 31, 2016
installment
shares
Jun. 06, 2012
shares
Jun. 14, 2006
shares
Restricted stock        
Stock-based compensation        
Granted (in shares) 87,076 171,252    
Forfeited (in shares) 22,694 7,167    
Restricted stock | Minimum        
Stock-based compensation        
Number of equal quarterly installments for vesting of awards | installment 12 12    
Restricted stock | Maximum        
Stock-based compensation        
Number of equal quarterly installments for vesting of awards | installment 20 20    
2006 Plan        
Stock-based compensation        
Number of shares of common stock initially available for award       800,000
Options reserved for future issuance (in shares) 0      
2012 Plan        
Stock-based compensation        
Number of shares of common stock initially available for award     600,000  
Options reserved for future issuance (in shares) 245,846