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FAIR VALUE ACCOUNTING (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
As at December 31, 2019 and 2018, the fair values of cash and cash equivalents, restricted cash, short-term deposits, receivables, accounts payable and accrued liabilities approximate their carrying values because of the short-term nature of these instruments.
December 31, 2019
Level 1
 
Level 2
 
Level 3
 
Total
Investments at fair value
$
654

 
$
—

 
$
—

 
$
654

Marketable equity securities
630

 
—

 
—

 
630

Marketable debt securities
—

 
4,208

 
—

 
4,208

Warrant liabilities (Note 12)
(2,791
)
 
—

 
—

 
(2,791
)
Convertible Debentures (Note 11)
(16,866
)
 
—

 
—

 
(16,866
)
 
$
(18,373
)
 
$
4,208

 
$
—

 
$
(14,165
)


December 31, 2018
Level 1
 
Level 2
 
Level 3
 
Total
Investments at fair value
$
1,107

 
$
—

 
$
—

 
$
1,107

Marketable equity securities
1,460

 
—

 
—

 
1,460

Marketable debt securities
—

 
25,601

 
—

 
25,601

Warrant liabilities (Note 12)
(5,621
)
 
—

 
(662
)
 
(6,283
)
Convertible Debentures (Note 11)
(15,880
)
 
—

 
—

 
(15,880
)
 
$
(18,934
)
 
$
25,601

 
$
(662
)
 
$
6,005
Fair Value, Assets Measured on Recurring Basis
The following table presents the activity for those items measured at fair value on a recurring basis using Level 3 inputs for the year ended December 31, 2019:


Level 3 Warrant Liabilities
Fair Value at December 31, 2018
$
662

Fair value of warrants exercised
—

Change in fair value (1)
(662
)
Fair Value at December 31, 2019
$
—


(1)
The gain (loss) recognized in included in Other Income (Expense) on the Consolidated Statement of Operations.