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FAIR VALUE ACCOUNTING (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
As of June 30, 2020, 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.
 
Level 1
 
Level 2
 
Level 3
 
Total
Investments at fair value
$
658

 
$
—

 
$
—

 
$
658

Marketable equity securities
675

 
—

 
—

 
675

Marketable debt securities
—

 
1,007

 
—

 
1,007

Warrant liabilities
(2,751
)
 
—

 
—

 
(2,751
)
Convertible Debentures
(15,631
)
 
—

 
—

 
(15,631
)
 
$
(17,049
)
 
$
1,007

 
$
—

 
$
(16,042
)