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SUPPLEMENTAL FINANCIAL INFORMATION
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Interest income
$
57

 
$
36

 
$
118

 
$
76

Change in value of investments accounted at fair value
(113
)
 
—

 
505

 
—

Change in value of warrant liabilities
571

 
1,178

 
1,416

 
1,879

Change in value of convertible debentures
160

 
323

 
(615
)
 
(666
)
Sale of surplus assets
—

 
—

 
1,138

 
—

Other
14

 
333

 
(110
)
 
814

Other income
$
689

 
$
1,870

 
$
2,452

 
$
2,103