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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]        
Minimum term of non-cancellable operating leases 1 year      
Expiration of non-cancellable operating leases maximum year 2019      
Future rent payment, 2014 $ 1,147,000      
Future rent payment, 2015 553,000      
Operating lease, rent expense 700,000 600,000 700,000  
Financing for leasehold improvement       1,100,000
Outstanding liability related to leasehold improvements 700,000      
Leasehold Improvements reflected in Accrued liabilities 100,000      
Leasehold Improvements reflected in Other non-current liabilities 600,000      
Purchase commitment, paid 6,500,000 7,200,000 3,600,000  
Future minimum purchase commitment 2014 3,400,000      
Future minimum purchase commitment 2015 1,300,000      
Future minimum purchase commitment 2016 1,300,000      
Additional Concord Lease
        
Commitments and Contingencies Disclosure [Line Items]        
Early termination of non-cancellable operating leases minimum period 2015-01      
Initial term of operating lease 2 years      
Number of renewal options 4      
Renewal period of operating lease 2 years      
Lease commencement date Aug. 01, 2013      
Future rent payment, 2014 154,368      
Future rent payment, 2015 $ 90,048