Annual report pursuant to Section 13 and 15(d)

Income Tax - Summary of Investment Tax Credits and Non-Capital Losses and Net Operating Losses (Detail)

v3.6.0.2
Income Tax - Summary of Investment Tax Credits and Non-Capital Losses and Net Operating Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses $ 158,391 $ 151,900
Non-capital Losses 115,950  
Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 5,109  
2018 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 10,795  
2018 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 150  
2019 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 32  
2019 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 102  
2020 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 2,745  
2020 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 76  
2021 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 400  
2021 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 69  
2022 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 11,766  
2022 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 105  
2023 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 10,785  
2023 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 96  
2024 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 16,814  
2024 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 111  
2025 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 2,062  
2025 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 144  
2026 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 27,157  
Non-capital Losses 7,335  
2026 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 400  
2027 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 22,225  
Non-capital Losses 4,949  
2027 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 173  
2028 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 12,648  
Non-capital Losses 8,020  
2028 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 390  
2029 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 4,358  
Non-capital Losses (9)  
2029 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 317  
2030 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 5,034  
Non-capital Losses 6,288  
2030 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 346  
2031 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 6,200  
Non-capital Losses 12,121  
2031 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 608  
2032 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 8,418  
Non-capital Losses 17,278  
2032 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 505  
2033 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 2,366  
Non-capital Losses 23,240  
2033 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 411  
2034 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 2,609  
Non-capital Losses 17,077  
2034 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 492  
2035 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 5,342  
Non-capital Losses 3,120  
2035 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits 328  
2036 [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Net Operating Losses 6,635  
Non-capital Losses 16,531  
2036 [Member] | Investment tax credits carryforwards [Member]    
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items]    
Investment tax credits $ 286