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FAIR VALUE ACCOUNTING (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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 March 31, 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
$
1,166

 
$
—

 
$
—

 
$
1,166

Marketable equity securities
1,268

 
—

 
—

 
1,268

Marketable debt securities
—

 
16,186

 
—

 
16,186

Warrant liabilities
(7,142
)
 
—

 
—

 
(7,142
)
Convertible debentures
(17,640
)
 
—

 
—

 
(17,640
)
 
$
(22,348
)
 
$
16,186

 
$
—

 
$
(6,162
)