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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Number of shares sold 24,000,000    
Proceeds from sale of subsidiary stock $ 27,500,000    
Ratio of remaining net proceed 0.25    
Short-term investment maturity period Three months or less    
Securities owned $ 0    
Weighted average number of common shares outstanding 80,128,827 73,889,112 70,179,935
Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful life 3 years    
Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, estimated useful life 10 years