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401(k) Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Defined contribution plan, employer matching contribution, percent of match 50.00%    
Defined contribution plan, employer matching contribution, percent 6.00%    
Defined contribution plan, vesting period 5 years    
Defined contribution plan, employer matching contribution, amount $ 608 $ 462 $ 376