Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Stock Based Compensation (Details 3)

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Stockholders' Equity and Stock Based Compensation (Details 3) - 2006 Plan and 2012 Plan - Restricted stock - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Shares        
Nonvested shares at the beginning of the period 162,609      
Granted (in shares) 44,000   98,689 56,500
Vested (in shares) (59,361)      
Forfeited (in shares) (4,465)   (34,487) (775)
Nonvested shares at the end of the period 142,783   162,609  
Weighted Average Grant Date Fair Value        
Nonvested shares at the beginning of period (in dollars per share) $ 14.36      
Granted (in dollars per share) 14.99      
Vested (in dollars per share) 13.64      
Forfeited (in dollars per share) 12.80      
Nonvested shares at the end of period (in dollars per share) $ 15.22   $ 14.36  
Unrecognized compensation cost (in dollars) $ 2.2      
Weighted average period for recognition of unrecognized compensation cost 2 years 10 months 24 days      
Share-based compensation cost (in dollars) $ 0.8 $ 0.9