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Debt - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Oct. 31, 2012
Debt Instrument [Line Items]        
Debt outstanding $ 0 $ 0 $ 0  
Revolver [Member]
       
Debt Instrument [Line Items]        
Amount of revolving credit facility       10,000,000
Expiry period of revolver   3 years    
Revolving credit facility, interest rate description   LIBOR + 2.00% per annum (for LIBOR loans) or the greater of 1.00% or the bank's prime rate minus 0.50% per annum (for base rate loans)    
Commitment fee   50,000    
Date of expiry   Oct. 16, 2015    
Unused credit facility fee   0.25%    
Borrowings under revolver $ 0 $ 0 $ 0  
Revolver [Member] | LIBOR Loans [Member]
       
Debt Instrument [Line Items]        
Revolving credit facility, interest rate description   LIBOR + 2.00% per annum (for LIBOR loans)    
Spread on variable rate   2.00%    
Revolver [Member] | Base Rate Loans [Member]
       
Debt Instrument [Line Items]        
Revolving credit facility, interest rate description   The greater of 1.00% or the bank's prime rate minus 0.50% per annum (for base rate loans)    
Base rate loan   1.00%    
Spread on variable rate   (0.50%)