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SUPPLEMENTAL FINANCIAL INFORMATION
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information
SUPPLEMENTAL FINANCIAL INFORMATION
The components of other income (expense) are as follows:
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2018
 
2017
 
2018
 
2017
Interest income
$
84

 
$
57

 
$
157

 
$
118

Change in value of investments accounted at fair value
1,127

 
(113
)
 
1,570

 
505

Change in value of warrant liabilities
(2,722
)
 
571

 
(3,802
)
 
1,416

Change in value of convertible debentures
(1,455
)
 
160

 
(1,135
)
 
(615
)
Sale of surplus assets
—

 
—

 
293

 
1,138

Foreign exchange gain (loss)
(170
)
 
—

 
(60
)
 
—

Gain on sale of assets held for sale
—

 
—

 
341

 
—

Other
(129
)
 
14

 
(67
)
 
(110
)
Other (expense) income
$
(3,265
)
 
$
689

 
$
(2,703
)
 
$
2,452