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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
sqft
Dec. 31, 2012
Dec. 31, 2011
Jul. 12, 2013
sqft
Operating Leased Assets [Line Items]        
Office building rentable area          
Monthly rent for property $ 51,000      
Term of lease 10 years      
Purchase of property latest time period 2015-02      
Purchase price of property 5,990,000      
Total rental expense 423,000 286,000 451,000  
Computer Equipment and Software [Member]
        
Operating Leased Assets [Line Items]        
Original cost of leased computer and software equipment $ 2,700,000