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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net loss for the year $ (114,233) $ (51,377)
Adjustments for:    
Depreciation and amortization 9,752 7,558
Impairment loss on trade receivables 54 310
Unrealized gain on forward contracts 519 (259)
Equity in loss of investment in joint venture and associates 16,140 12,557
Net decrease (increase) in fair value of investments 9,024 0
Gain on sale of assets 0 (168)
Impairment loss on property plant and equipment 263 0
Accretion on decommissioning liabilities 113 76
Employee future benefits 131 164
Employee future benefits plan contributions (8) (908)
Share-based compensation 9,669 6,237
Deferred income tax expense (recovery) (300) 0
Total Adjustments (68,876) (25,810)
Changes in non-cash working capital:    
Trade and other receivables 9,640 (2,093)
Inventories (22,996) 1,355
Prepaid expenses and other current assets (810) (1,026)
Trade and other payables 1,408 (4,238)
Deferred revenue 2,221 (10,268)
Warranty provision (1,063) (854)
Changes in non-cash working capital: (11,600) (17,124)
Cash used in operating activities (80,476) (42,934)
Investing activities:    
Net change in short-term investments 336 (2,000)
Acquisition of long-term investments (51,757) 0
Additions to property, plant and equipment (13,158) (12,620)
Proceeds on sale of assets 0 988
Investment in other intangible assets (1,543) (246)
Investment in joint venture and associates (12,351) (22,515)
Acquisition of Arcola Energy Limited, net of cash acquired (7,157) 0
Cash used in investing activities (85,630) (36,393)
Financing activities:    
Principal payments of lease liabilities (2,798) (2,517)
Net proceeds on issuance of share capital from share option exercises 2,415 4,438
Net proceeds on issuance of share capital from equity offerings 527,291 694,608
Cash provided by financing activities 526,908 696,529
Effect of exchange rate fluctuations on cash and cash equivalents held (337) (1,564)
Increase in cash and cash equivalents 360,465 615,638
Cash and cash equivalents, beginning of year 763,430 147,792
Cash and cash equivalents, end of year $ 1,123,895 $ 763,430