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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]    
Unrecognized tax benefits $ 0 $ 0
Increase in valuation allowances 13,126,000 $ 10,657,000
Tax liabilities 0  
Tax related interest 0  
Tax related penalties 0  
Domestic Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Net operating loss carry forward $ 169,972,000  
Operating loss carry forward expiration period description 2018 through 2035  
Excess deductions from exercise of stock option $ 1,792,000  
State and Local Jurisdiction [Member]    
Income Tax Contingency [Line Items]    
Net operating loss carry forward $ 34,136,000  
Operating loss carry forward expiration period description 2016 through 2035  
Operating loss carry forward for the exercise of stock $ 1,362,000  
Foreign Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Net operating loss carry forward 1,128,000  
Capital Loss Carryforward [Member] | Domestic And State [Member]    
Income Tax Contingency [Line Items]    
Capital loss carry forward for federal and state income tax purposes $ 746,000  
Operating loss carry forward expiration period description 2016  
Research and Development [Member] | Domestic Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Operating loss carry forward expiration period description 2018 through 2035  
Capital loss carry forward for federal and state income tax purposes $ 6,725,000  
Research and Development [Member] | State and Local Jurisdiction [Member]    
Income Tax Contingency [Line Items]    
Capital loss carry forward for federal and state income tax purposes 5,842,000  
State research and development tax credits net of federal tax effect $ 3,856,000