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Condensed Consolidated Interim Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows provided by (used in) operating activities:    
Net income (loss) $ 4,591 $ 9,509
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,540 5,587
Amortization of deferred charges 57 57
Share of income from joint ventures (4,885) (14,115)
Interest expense 1,273 2,018
Interest income (577) (651)
Interest paid on long-term debt (1,318) (2,013)
Gain on settlement agreement (4,681)  
Loss (gain) on disposal of assets 6 (13,558)
Non-cash lease expense (935) (778)
Interest paid on finance leases (3) (6)
Share-based compensation 1,329 2,663
Deferred income taxes (321) (749)
Changes in non-cash working capital items 4,938 4,149
Net cash provided by (used) in operating activities 4,014 (7,887)
Cash flows used in investing activities:    
Purchases of property, plant and equipment, net of rebate (1,076) (1,630)
Advances to joint ventures (133) (9,499)
Proceeds from sale of asset   52
Investment in joint ventures (11,713) (13)
Investment in minority interests (1,226)  
Net cash used in investing activities (14,148) (11,090)
Cash flows from financing activities:    
Proceeds from borrowings 3,000 3,000
Repayments on borrowings (4,326) (3,591)
Proceeds from issuance of common stock 46,388 13,868
Issuance costs (3,819)  
Proceeds from exercise of stock options 251 109
Payments on capital lease obligations (51) (69)
Proceeds from exercise of warrants 11,369 466
Net cash provided by financing activities 52,812 13,783
Effect of exchange rate changes on cash and cash equivalents (1)  
Net increase (decrease) in cash and cash equivalents 42,677 (5,194)
Cash and cash equivalents, beginning of period 11,989 11,920
Cash and cash equivalents, end of period $ 54,666 $ 6,726