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FAIR VALUE ACCOUNTING (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
The following tables set forth the fair value of the Company's assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy as of June 30, 2019. As required by accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
As of June 30, 2019, 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
$
721

 
$
—

 
$
—

 
$
721

Marketable equity securities
1,138

 
—

 
—

 
1,138

Marketable debt securities
—

 
10,296

 
—

 
10,296

Warrant liabilities
(5,412
)
 
—

 
—

 
(5,412
)
Convertible debentures
(17,055
)
 
—

 
—

 
(17,055
)
 
$
(20,608
)
 
$
10,296

 
$
—

 
$
(10,312
)