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SUPPLEMENTAL FINANCIAL INFORMATION (Tables)
9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Nonoperating Income (Expense)
The components of other income are as follows:
Three months ended
September 30,
Nine months ended
September 30,
2020201920202019
Interest income$(4)$134 $124 $386 
Change in value of investments accounted for at fair value258 (589)394 (576)
Change in value of warrant liabilities307 2,166 215 3,281 
Change in value of Convertible Debentures153 940 153 447 
Foreign exchange gain (loss)(105)(15)876 (34)
Other19 (324)(17)(323)
Other income$628 $2,312 $1,745 $3,181