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Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning Balances (in shares) at Dec. 31, 2013   21,661,908    
Beginning Balances at Dec. 31, 2013 $ (6,167) $ 22 $ 106,086 $ (112,275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation (in shares)   40,729    
Stock-based compensation 4,712   4,712  
Issuance of stock to 401(k) plan (in shares)   5,250    
Issuance of stock to 401(k) plan 127   127  
Issuance of stock upon exercise of options, net (in shares)   260,126    
Issuance of stock upon exercise of options, net 243   243  
Repurchase of shares to satisfy tax withholdings (in shares)   (114,750)    
Repurchase of shares to satisfy tax withholdings (1,500)   (1,500)  
Reclassification and settlement of equity awards 501   501  
Net income (loss) 1,387     1,387
Ending Balances (in shares) at Dec. 31, 2014   21,853,263    
Ending Balances at Dec. 31, 2014 (697) $ 22 110,169 (110,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation (in shares)   127,867    
Stock-based compensation 6,462   6,462  
Clawback of equity awards (in shares)   (20,656)    
Clawback of equity awards (325)   (325)  
Repurchase of shares to satisfy tax withholdings (in shares)   (16,602)    
Repurchase of shares to satisfy tax withholdings (277)   (277)  
Net income (loss) (30,141)     (30,141)
Ending Balances (in shares) at Dec. 31, 2015   21,943,872    
Ending Balances at Dec. 31, 2015 (24,978) $ 22 116,029 (141,029)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation (in shares)   405,354    
Stock-based compensation 2,762   2,762  
Repurchase of shares to satisfy tax withholdings (in shares)   (27,204)    
Repurchase of shares to satisfy tax withholdings (196)   (196)  
Reclassification and settlement of equity awards 899   899  
Net income (loss) 97,678     97,678
Ending Balances (in shares) at Dec. 31, 2016   22,322,022    
Ending Balances at Dec. 31, 2016 $ 76,165 $ 22 $ 119,494 $ (43,351)