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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:        
Net loss     $ (6,569) $ (839)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization $ 270 $ 337 814 897
Accretion of asset retirement obligation     167 147
Loss (gain) on trading securities     217 (50)
Asset write off     19 11
Gain on reduction of asset retirement obligation     (63)  
Gain on sale of assets     (144) (4,335)
Stock compensation     725 111
Changes in operating assets and liabilities from continuing operations:        
Decrease (increase) in plant lease receivable     (21) 167
Increase in right of use assets     (396)  
Decrease in prepaid expenses and other assets     244 271
Decrease (increase) in inventories     3 (9)
Decrease in value added tax recoverable, net     2 128
Decrease in reclamation liability     (5) (17)
Increase in accounts payable and accrued liabilities     135 395
Increase in leasehold liability     427  
Decrease in deferred revenue     (219) (219)
Increase in deferred labilities     1,500  
Decrease in other liabilities       (25)
Net cash used in operating activities     $ (3,122) $ (3,701)