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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding (shares) 3,134,094 2,086,450 2,068,720 562,025
Fair market value of options granted (usd per share) $ 3.59 $ 2.64 $ 2.79  
Fair value of shares vested $ 1,500 $ 1,200 $ 1,200  
Options exercises in period 56,250 0 0  
Intrinsic value of options exercised $ 40      
Proceeds from the exercise of stock options 255 $ 0 $ 0  
Unrecognized compensation costs, options $ 4,100      
Number of nonvested stock options (shares) 1,654,155      
Weighted average exercise price of nonvested stock options (usd per share) $ 4.23      
Intrinsic value of nonvested options $ 1,000      
Service Based Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average period to recognize compensation cost (years) 2 years 8 months      
2009 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance 5,600,000      
2009 Equity Incentive Plan | Share Based Compensation Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration term, do not exceed (years) 10 years      
Stock options vesting percent per year 25.00%      
Stock options vesting term (years) 4 years      
Options available for grant (shares) 2,426,659      
Equity Incentive Consultants | Share Based Compensation Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding (shares) 206,000