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Share Capital - Disclosure of Range of Exercise Prices of Outstanding Share Purchase Warrants (Detail) - Share Purchase Warrants [member] | 12 Months Ended |  |
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Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 24,051,190 | 24,565,862 | 23,457,178
Weighted average exercise price | $ 12.00 | $ 11.90 | $ 12.45
3.67 - $4.99 [Member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 3,632,455 |  |
Weighted average exercise price | $ 4.43 |  |
Expiry dates | June 2020 – May 2021 |  |
3.67 - $4.99 [Member] | Bottom of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 3.67 |  |
3.67 - $4.99 [Member] | Top of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 4.99 |  |
$5.00 - $9.99 [Member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 3,359,046 |  |
Weighted average exercise price | $ 5.61 |  |
Expiry dates | June 2020 – May 2023 |  |
$5.00 - $9.99 [Member] | Bottom of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 5.00 |  |
$5.00 - $9.99 [Member] | Top of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 9.99 |  |
$10.00 - $14.99 [Member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 830,495 |  |
Weighted average exercise price | $ 11.53 |  |
Expiry dates | December 2020 – August 2021 |  |
$10.00 - $14.99 [Member] | Bottom of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 10.00 |  |
$10.00 - $14.99 [Member] | Top of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 14.99 |  |
$15.00 - $19.99 [Member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 16,093,384 |  |
Weighted average exercise price | $ 15.00 |  |
Expiry dates | October 2021 |  |
$15.00 - $19.99 [Member] | Bottom of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 15.00 |  |
$15.00 - $19.99 [Member] | Top of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 19.99 |  |
$20.00 - $25.00 [Member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Shares issuable on exercise of warrants | shares | 135,810 |  |
Weighted average exercise price | $ 20.83 |  |
Expiry dates | June 2020 – July 2020 |  |
$20.00 - $25.00 [Member] | Bottom of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 20.00 |  |
$20.00 - $25.00 [Member] | Top of range [member] |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Purchase Warrants [Line Items] |  |  |
Range of exercise price | $ 25.00 |  |

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