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Commitments and Contingencies - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Oct. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Commitments And Contingencies Disclosure [Line Items]      
Rent expense   $ 1,120,000 $ 1,026,000
Operating lease agreement period 15 years    
Financing obligation   $ 16,157,000  
Minimum      
Commitments And Contingencies Disclosure [Line Items]      
Operating lease expiration year   2016  
Maximum      
Commitments And Contingencies Disclosure [Line Items]      
Operating lease expiration year   2026