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Employee Benefit Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Benefit Plan      
Minimum age requirement for employees to participate in the plan 21 years    
Maximum contribution by employee (as a percent) 90.00%    
Vesting percentage of contributions by employee to the 401(k) Plan 100.00%    
Employer match of employee contributions on the first level of salary deferral (as a percent) 100.00%    
Percentage of eligible compensation, first level, matched by employer 3.00%    
Employer match of employee contributions on the second level of salary deferral (as a percent) 50.00%    
Percentage of eligible compensation, second level, partially matched by employer 2.00%    
Maximum percentage of participating employee annual compensation that the company may elect to make a discretionary contribute towards 60.00%    
Company's contribution to the 401(k) Plan $ 1.4 $ 1.1 $ 0.6