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Stock Plans (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
share_based_compensation_plan
shares
$ / shares
Mar. 31, 2015
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
share_based_compensation_plan
form
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Stock Plans (Textual) [Abstract]          
Stock-based compensation plans | share_based_compensation_plan 2     2  
Stock options granted during the period 33,546     263,203 0
Average grant date fair value per share | $ / shares $ 2.74     $ 3.56  
Stock-based compensation expense | $       $ 1,850 $ 1,921
Executives          
Stock Plans (Textual) [Abstract]          
Number of forms of equity awards | form       3  
Stock Options          
Stock Plans (Textual) [Abstract]          
Stock-based compensation expense | $ $ 57   $ 43 $ 80 41
Fair value per share | $ / shares $ 2.74     $ 3.56  
Restricted stock awards          
Stock Plans (Textual) [Abstract]          
Restricted stock granted 255,600        
Fair value per share | $ / shares $ 14.20        
Restricted stock unit awards          
Stock Plans (Textual) [Abstract]          
Number of forms of equity awards | form       2  
Restricted stock unit vesting period (in years)       1 year  
Restricted stock unit, granted 86,886   137,000 674,883  
Number of unrestricted shares of common stock received upon vesting 1        
Restricted stock unit awards | Share-based Compensation Award, Tranche One          
Stock Plans (Textual) [Abstract]          
Restricted stock unit vesting period (in years) 4 years   4 years    
Fair value per share | $ / shares $ 6.03   $ 15.17 $ 7.15  
Restricted stock unit, granted 63,012   67,000 460,052  
Restricted stock unit awards | Share-based Compensation Award, Tranche Three          
Stock Plans (Textual) [Abstract]          
Fair value per share | $ / shares $ 6.03     $ 7.19  
Restricted stock unit, granted 23,874     214,831  
Restricted stock unit awards | Share-based Compensation Award, Tranche Two          
Stock Plans (Textual) [Abstract]          
Restricted stock unit vesting period (in years)     3 years    
Fair value per share | $ / shares     $ 7.71    
Restricted stock unit, granted     70,000    
Restricted stock unit awards | Non-employee directors          
Stock Plans (Textual) [Abstract]          
Stock-based compensation expense | $ $ 158   $ 145 $ 288 $ 321
Fair value per share | $ / shares   $ 5.81   $ 7.08 $ 9.03
Restricted stock unit, granted   11,263   93,212 65,891
Employee stock purchase plan          
Stock Plans (Textual) [Abstract]          
Stock-based compensation expense | $ $ 57   $ 201 $ 140 $ 343
Discount rate from market value on offering date       85.00%