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FAIR VALUE ACCOUNTING (Tables)
 3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
As of March 31, 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
$
366

 
$
—

 
$
—

 
$
366

Marketable equity securities
419

 
—

 
—

 
419

Marketable debt securities
—

 
2,013

 
—

 
2,013

Warrant liabilities
(1,468
)
 
—

 
—

 
(1,468
)
Convertible Debentures
(14,557
)
 
—

 
—

 
(14,557
)
 
$
(15,240
)
 
$
2,013

 
$
—

 
$
(13,227
)