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Commitments and Contingencies - Bank Loan Agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Secured promissory note        
Debt Instrument [Line Items]        
Principal   $ 23,000 $ 2,000  
Interest   652 664  
Total   $ 23,652 $ 2,664  
Notes Payable to Banks        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding       $ 25,000
Rate of interest (as a percent)       3.25%
Extinguishment of debt $ 21,600