Annual report pursuant to Section 13 and 15(d)

Income Tax - Additional Information (Detail)

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Income Tax - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Income tax rate assumed for both State and Foreign deferred tax calculations 34.00% 34.00% 34.00%
Future enacted income tax rate assumed for both State and Foreign deferred tax calculations 34.00% 34.00% 34.00%
Non capital loss for income tax carryforwards $ 80,934,000 $ 58,300,000  
Net operating loss carryforwards 150,255,000 141,500,000  
Unclaimed tax deductions 13,800,000    
Starting range of research and development tax credits expiration period 2014    
Ending range of research and development tax credits expiration period 2033    
Deferred tax assets recognized 0 0  
Percentage of likelihood for recognition of uncertain tax position 50.00%    
Unrecognized tax benefits 2,000,000    
Accrued interest and penalties related to income taxes 0 0  
Canada [Member]
      
Income Taxes [Line Items]      
Income tax rate assumed for both State and Foreign deferred tax calculations 25.75% 25.00% 26.50%
Future enacted income tax rate assumed for both State and Foreign deferred tax calculations 26.00% 25.00% 25.00%
Research [Member]
      
Income Taxes [Line Items]      
Investment tax credits 600,000    
Investment tax credits carryforwards [Member]
      
Income Taxes [Line Items]      
Investment tax credits $ 4,020,000 $ 2,000,000