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SUPPLEMENTAL FINANCIAL INFORMATION
 9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information
SUPPLEMENTAL FINANCIAL INFORMATION
The components of other income are as follows:
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2019
 
2018
 
2019
 
2018
Interest income
$
134

 
$
84

 
$
386

 
$
157

Change in value of investments accounted for at fair value
(589
)
 
1,127

 
(576
)
 
1,570

Change in value of warrant liabilities
2,166

 
(2,722
)
 
3,281

 
(3,802
)
Change in value of convertible debentures
940

 
(1,455
)
 
447

 
(1,135
)
Sale of surplus assets
—

 
—

 
—

 
293

Foreign exchange loss
(15
)
 
(170
)
 
(34
)
 
(60
)
Gain on sale of assets held for sale
—

 
—

 
—

 
341

Other
(324
)
 
(129
)
 
(323
)
 
(67
)
Other income (loss)
$
2,312

 
$
(3,265
)
 
$
3,181

 
$
(2,703
)