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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Unrecognized tax benefits $ 0 $ 0
Increase in valuation allowances 10,270,000 864,000
Tax liabilities 0  
Tax related interest 0  
Tax related penalties 0  
Domestic Tax Authority [Member]
    
Net operating loss carry forward 154,541,000  
Operating loss carryforward expiration period description 2018 through 2033  
Excess deductions from exercise of stock option 1,792,000  
State and Local Jurisdiction [Member]
    
Net operating loss carry forward 43,747,000  
Operating loss carryforward expiration period description 2014 through 2033  
Operating loss carry forward for the exercise of stock 1,362,000  
Foreign Tax Authority [Member]
    
Net operating loss carry forward 11,896,000  
Capital Loss Carryforward [Member] | Domestic And State [Member]
    
Operating loss carryforward expiration period description 2014 through 2016  
Capital loss carry forward for federal and state income tax purposes 1,592,000  
Research and Development [Member] | Domestic Tax Authority [Member]
    
Operating loss carryforward expiration period description 2018 through 2033  
Capital loss carry forward for federal and state income tax purposes 5,656,000  
Research and Development [Member] | State and Local Jurisdiction [Member]
    
Capital loss carry forward for federal and state income tax purposes 4,962,000  
State research and development tax credits net of federal tax effect $ 3,275,000