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Commitments and Contingencies - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
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  
Financing for leasehold improvement   $ 1,100,000
Outstanding liability related to leasehold improvements 800,000  
Leasehold Improvements reflected in Accrued liabilities 100,000  
Leasehold Improvements reflected in Other non-current liabilities 700,000  
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, 2013 51,456  
Future rent payment, 2014 154,368  
Future rent payment, 2015 $ 90,048