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Employee Benefit Plans and Stock-based Compensation - Retirement Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted average assumptions [Abstract]      
Expected term 3 years 10 months 24 days 4 years 1 month 6 days 4 years
Volatility (in hundredths) 51.10% 63.20% 59.20%
Risk-free interest rate (in hundredths) 1.75% 1.85% 0.98%
Retirement Savings Plan [Abstract]      
Period after which all full time employees are eligible to participate in the savings plan 90 days    
Maximum percentage of employer matching contribution if employees contribute at least 6% of base pay (in hundredths) 4.00%    
Minimum percentage of employee contribution to get 4% of employer's contribution (in hundredths) 6.00%    
Contributions to the retirement savings plans $ 125,000 $ 115,000 $ 110,000
2015 Equity Incentive Plan      
Weighted average assumptions [Abstract]      
Expected term 10 years