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Summary of Status of Equity Incentive Plan (Detail)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Weighted Average Exercise Price, Forfeitures $ 10.51   $ 10.58    
Canadian Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 4,733,156 4,733,156 4,900,360 4,900,360  
Options Outstanding, Granted | shares     490,200 490,200  
Options Outstanding, Forfeited | shares (711,572) (711,572) (657,404) (657,404)  
Options Outstanding, Ending balance | shares 4,021,584 4,021,584 4,733,156 4,733,156  
Weighted Average Exercise Price, Beginning balance $ 7.78   $ 8.50    
Weighted Average Exercise Price, Granted     4.35    
Weighted Average Exercise Price, Ending balance $ 7.29   $ 7.78    
Options exercisable | shares 3,569,069 3,569,069 3,786,473 3,786,473 3,734,019
Canadian Share Options [Member] | Top of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance $ 14.31   $ 14.50    
Range of Exercise Prices, Granted     4.35    
Range of Exercise Prices, Forfeitures 10.67   14.50    
Range of Exercise Prices, Ending balance 14.31   14.31    
Canadian Share Options [Member] | Bottom Of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance 4.35   4.46    
Range of Exercise Prices, Granted     4.35    
Range of Exercise Prices, Forfeitures 7.15   10.44    
Range of Exercise Prices, Ending balance $ 4.35   $ 4.35    
U.S. Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 6,065,850 6,065,850 5,558,621 5,558,621  
Options Outstanding, Granted | shares 599,300 599,300 1,569,250 1,569,250  
Options Outstanding, Exercised | shares 0 0 (66,000) (66,000)  
Options Outstanding, Forfeited | shares (302,100) (302,100) (996,021) (996,021)  
Options Outstanding, Ending balance | shares 6,363,050 6,363,050 6,065,850 6,065,850  
Weighted Average Exercise Price, Beginning balance   $ 5.17   $ 6.16  
Weighted Average Exercise Price, Granted   2.56   3.45  
Exercise Price Of Exercised Share Options       3.21  
Weighted Average Exercise Price, Forfeitures   10.68   8.08  
Weighted Average Exercise Price, Ending balance   $ 4.67   $ 5.17  
Options exercisable | shares 4,348,824 4,348,824 3,224,078 3,224,078 2,891,808
U.S. Share Options [Member] | Top of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance   $ 10.74   $ 15.21  
Range of Exercise Prices, Granted   2.56   3.62  
Range of Exercise Prices, Exercised       3.21  
Range of Exercise Prices, Forfeitures   10.74   15.21  
Range of Exercise Prices, Ending balance   9.18   10.74  
U.S. Share Options [Member] | Bottom Of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance   3.21   3.21  
Range of Exercise Prices, Granted   2.56   3.44  
Range of Exercise Prices, Exercised       3.21  
Range of Exercise Prices, Forfeitures   7.79   3.21  
Range of Exercise Prices, Ending balance   $ 2.56   $ 3.21