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Share Capital (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure of Share Capital, Reserves And Other Equity Interest [Abstract]  
Schedule of share capital
Shares
NumberAmount
As at December 31, 201932,198,453 $311,078 
Issued pursuant to stock option plan133,454 385 
Issued pursuant to incentive share award plan234,172 732 
Issued pursuant to "At the Market" (ATM) equity distribution agreement(a)(c)
12,182,532 40,038 
Issued pursuant to warrant derivative exercised(b)
1,418,369 6,333 
Share issue costs— (1,742)
As at December 31, 202046,166,980 $356,824 
Issued pursuant to stock option plan123,159 381 
Issued pursuant to incentive share award plan150,899 544 
Issued pursuant to "At the Market" (ATM) equity distribution agreement(c)(d)
8,401,029 34,168 
Issued pursuant to warrant derivative exercised(b)
201,722 687 
Share issue costs— (1,256)
As at December 31, 202155,043,789 $391,348 
Issued pursuant to stock option plan8,333 20 
Issued pursuant to incentive share award plan40,560 98 
Issued pursuant to "At the Market" (ATM) equity distribution agreement(d)(e)
6,235,232 13,338 
Share issue costs— (764)
As at December 31, 202261,327,914 $404,040 
(a)On October 24, 2018, we entered into an ATM equity offering sales agreement with Canaccord Genuity Inc. The ATM allowed us to issue common shares, at prevailing market prices, with an aggregate offering value of up to US$30,000 over a 19-month period through the facilities of the Nasdaq Capital Market in the United States. This sales agreement expired on June 4, 2020. In 2020, we sold 6,741,518 common shares for gross proceeds of US$17,538 at an average price of US$2.42. We received, net of commissions of US$526, proceeds of US$17,012. In total, we incurred share issue costs (including commissions) of $857.

(b)On August 16, 2019, pursuant to an underwritten public offering, 4,619,773 units were sold at a purchase price of US$0.81 per unit for gross proceeds of US$3,742. Each unit included one common share with a fair value of US$0.54 and one common share purchase warrant with a fair value of US$0.27. These warrants were classified as a financial liability (see Note 16). Each common share purchase warrant entitled the holder to purchase one common share at an exercise price of US$0.90 until August 16, 2024. In 2022, no warrants were exercised. In 2021, 201,722 (2020 - 1,418,369) warrants with a fair value of $456 (2020 - $4,636) were exercised for gross proceeds of US$182 (2020 - US$1,277). As at December 31, 2022, there were 64,035 warrants outstanding (December 31, 2021 - 64,035).

(c)On June 15, 2020, we entered into an ATM equity distribution agreement with Canaccord Genuity Inc. The ATM allowed us to issue common shares, at prevailing market prices, with an aggregate offering value of up US$40,000 over a 25-month period through the facilities of the Nasdaq Capital Market in the United States. This sales agreement was terminated on March 4, 2021. In 2021, we sold 5,685,097 (2020 - 5,441,014) common shares for gross proceeds of US$18,503 (2020 - US$12,629) at an average price of US$3.25 (2020 - US$2.11). We received, net of commissions of US$555 (2020 - US$379), proceeds of US$17,948 (2020 - US$12,250). In total, we incurred share issue costs (including commissions) of $707 (2020 - $885).
(d)On March 5, 2021, we entered into an ATM equity distribution agreement with Canaccord Genuity Inc. The ATM allows us to issue common shares, at prevailing market prices, with an aggregate offering value of up to US$80,000 over a 16-
month period through the facilities of the Nasdaq Capital Market in the United States. In 2022, we sold 2,719,770 (2021 - 2,715,932) common shares for gross proceeds of US$4,560 (2021 - US$8,655) at an average price of US$1.68 (2021 - US$3.19). We received, net of commissions of US$137 (2021 - US$260), proceeds of US$4,423 (2021 - US$8,395). In total, we incurred share issue costs (including commissions) of $209 (2021 - $549). This sales agreement was terminated on June 16, 2022.
(e)On June 17, 2022, we entered into an ATM equity distribution agreement with Canaccord Genuity Inc. The ATM allows us to issue common shares, at prevailing market prices, with an aggregate offering value of up to US$65,000 over a 25-month period through the facilities of the Nasdaq Capital Market in the United States. In 2022, we sold 3,515,462 common shares for gross proceeds of US$5,632 at an average price of US$1.60. We received, net of commissions of US$169, proceeds of US$5,463. In total, we incurred share issue costs (including commissions) of $555.
Summary of outstanding warrants
The following table summarizes our outstanding equity warrants:
Number of Warrants OutstandingWarrant
As at December 31, 201916,445,000 $3,618 
As at December 31, 202016,443,500 $3,618 
As at December 31, 202116,443,500 $3,618 
Expired(16,443,500)(3,618)
As at December 31, 2022— $— 
The following table summarizes information about the stock options outstanding and exercisable at December 31, 2022:
Range of Exercise PricesNumber OutstandingWeighted Average Remaining Contractual Life (years)Weighted Average Exercise Price
$		Number ExercisableWeighted Average Exercise Price
$
$0.54 - $1.89
1,002,498 1.761.39799,998 1.40
$1.90 - $3.05
1,724,442 3.312.341,001,738 2.37
$3.06 - $3.29
1,532,500 1.953.171,532,500 3.17
$3.30 - $3.75
1,393,131 2.873.42775,632 3.43
$3.76 - $27.46
310,614 2.197.39310,614 7.39
5,963,185 2.542.914,420,482 3.01