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SUPPLEMENTAL FINANCIAL INFORMATION (Tables)
3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Nonoperating Income (Expense)
The components of other (loss) income are as follows:
 
Three months ended
March 31,
 
2019
 
2018
Interest income
$
111

 
$
50

Change in value of investments accounted for at fair value
375

 
(224
)
Change in value of warrant liabilities
(732
)
 
364

Change in value of convertible debentures
(1,436
)
 
(145
)
Sale of surplus assets

 
14

Other
(1
)
 
4

Other (loss) income
$
(1,683
)
 
$
63