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FAIR VALUE ACCOUNTING (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
As of June 30, 2021, 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 1Level 2Level 3Total
Investments at fair value$1,828 $— $— $1,828 
Marketable equity securities422 — — 422 
Warrant liabilities(8,899)— — (8,899)
$(6,649)$— $— $(6,649)