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SUPPLEMENTAL FINANCIAL INFORMATION
 6 Months Ended
Jun. 30, 2020
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
June 30,

Six months ended
June 30,
 
2020
 
2019
 
2020
 
2019
Interest income
$
56

 
$
142

 
$
128

 
$
252

Change in value of investments accounted for at fair value
527

 
(362
)
 
136

 
13

Change in value of warrant liabilities
(1,238
)
 
1,846

 
(92
)
 
1,115

Change in value of Convertible Debentures
(465
)
 
943

 
—

 
(493
)
Foreign exchange (loss) gain
(255
)
 
(16
)
 
981

 
(19
)
Other
—

 
(1
)
 
(36
)
 
1

Other (loss) income
$
(1,375
)
 
$
2,552

 
$
1,117

 
$
869