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Employee Benefit Plans and Stock-based Compensation - RSU (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 7,147    
Options [Member]      
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 3,779    
Restricted Stock Awards [Member]      
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 546    
2007 Equity Incentive Plan | Options [Member]      
Shares [Roll Forward]      
Granted (in shares)   712,000  
2015 Equity Incentive Plan      
Weighted Average Grant Date Fair Value [Roll Forward]      
Common stock reserved for future issuance 2,822    
2015 Equity Incentive Plan | Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options exercised (in shares) 119,000 111,000 331,000
Intrinsic value of options exercised $ 118,000,000 $ 105,000,000 $ 331,000,000
Compensation costs related to unvested stock options not yet recognized 1,400,000    
Value of estimated forfeitures $ 94,000    
Weighted-average period of amortization 3 years 1 month 6 days    
Shares [Roll Forward]      
Granted (in shares) 866,000   488,000
Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 0.88 $ 1.17 $ 1.09
2015 Equity Incentive Plan | Restricted Stock Awards [Member]      
Shares [Roll Forward]      
Non-vested, beginning of period (in shares) 261 241 239
Granted (in shares) 547 121 104
Vested (in shares) (215) (101) (85)
Forfeited (in shares) (47)   (16)
Non-vested, end of period (in shares) 546 261 241
Weighted Average Grant Date Fair Value [Roll Forward]      
Non-vested, beginning of period (in dollars per share) $ 2.71 $ 3.44 $ 4.27
Granted (in dollars per share) 2.42 2.34 2.52
Vested (in dollars per share) 2.81 4.01 4.56
Forfeited (in dollars per share) 2.47   4.03
Non-vested, end of period (in dollars per share) $ 2.39 $ 2.71 $ 3.44
Total fair value of restricted stock awards vested $ 605,000 $ 405,000 $ 389,000
Unrecognized compensation expense related to restricted stock awards $ 1,200,000    
Weighted average remaining contractual terms 1 year 9 months 18 days