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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]          
Net operating loss carryforwards $ 0   $ 0    
Tax benefit recognized   $ 0   $ 0  
Benefit for income taxes   $ 552,000      
Gain from equity method investment 5,000,000   5,000,000    
Valuation allowance, deferred tax assets 25,754,000   25,754,000    
Deferred tax assets valuation allowance increase         $ 10,241,000
Amount generated in cash refund 1,600,000   $ 1,600,000    
Great Wall Semiconductor Corporation (GWS) [Member]          
Income Tax Disclosure [Line Items]          
Gain from equity method investment 4,999,719        
Gain from equity method investment for income tax purpose 4,999,719        
Gain (loss) on transaction for income tax purpose $ 0