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Employee Benefit Plans and Stock-based Compensation - RSU (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 6,404    
Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock options exercised (in shares) 555,000 119,000 111,000
Intrinsic value of options exercised $ 1,302,000 $ 118,000 $ 105,000
Compensation costs related to unvested stock options not yet recognized 1,900,000    
Value of estimated forfeitures $ 120,000    
Weighted-average period of amortization 2 years 10 months 24 days    
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 3,294    
Restricted Stock Awards [Member]      
Shares [Roll Forward]      
Non-vested, beginning of period (in shares) 546 261 241
Granted (in shares) 136 547 121
Vested (in shares) (150) (215) (101)
Forfeited (in shares) (207) (47)  
Non-vested, end of period (in shares) 325 546 261
Weighted Average Grant Date Fair Value [Roll Forward]      
Non-vested, beginning of period (in dollars per share) $ 2.39 $ 2.71 $ 3.44
Granted (in dollars per share) 4.66 2.42 2.34
Vested (in dollars per share) 2.34 2.81 4.01
Forfeited (in dollars per share) 2.55 2.47  
Non-vested, end of period (in dollars per share) $ 3.27 $ 2.39 $ 2.71
Total fair value of restricted stock awards vested $ 351,000 $ 605,000 $ 405,000
Unrecognized compensation expense related to restricted stock awards $ 876,000    
Weighted average remaining contractual terms 1 year 7 months 6 days    
Common stock reserved for future issuance 325    
2007 Equity Incentive Plan | Options [Member]      
Shares [Roll Forward]      
Granted (in shares)   866,000  
2015 Equity Incentive Plan      
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 2,785    
2015 Equity Incentive Plan | Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock options exercised (in shares) 555,000 119,000 111,000
Shares [Roll Forward]      
Granted (in shares) 624,000   712,000
Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 1.85 $ 0.88 $ 1.17