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SUPPLEMENTAL FINANCIAL INFORMATION
 6 Months Ended
Jun. 30, 2017
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
June 30,
 
Six months ended
June 30,
 
2017
 
2016
 
2017
 
2016
Interest income
$
32

 
$
20

 
$
61

 
$
40

Change in value of investments accounted at fair value
119

 
(69
)
 
618

 
—

Change in value of warrant liabilities
3,038

 
448

 
845

 
701

Change in value of convertible debentures
147

 
(428
)
 
(775
)
 
(989
)
Sale of surplus assets
345

 
—

 
1,138

 
—

Other
(1
)
 
500

 
(124
)
 
481

Other income (expense)
$
3,680

 
$
471

 
$
1,763

 
$
233