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FAIR VALUE MEASUREMENT (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Financial Assets not Measured at Fair Value on a Recurring Basis
The following tables present the financial assets not measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020:
September 30, 2021
Carrying ValueEstimated Fair ValueFair Value HierarchyFinancial Statement Line Item
Financial assets:
Notes receivable - current$32 $32 Level 3Receivables
Notes receivable - non-current4,944 4,944 Level 3Other long-term assets
Total financial assets$4,976 $4,976 
December 31, 2020
Carrying ValueEstimated Fair ValueFair Value HierarchyFinancial Statement Line Item
Financial assets:
Notes receivable - non-current$4,891 $4,891 Level 3Other long-term assets
Total financial assets$4,891 $4,891 
Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the liabilities measured at fair value on a recurring basis, by input level, in the Consolidated Balance Sheets at September 30, 2021:
September 30, 2021
Level 1Level 2Level 3Total
Financial liabilities:
Public Warrants$5,525 — — 5,525 
Private Warrants— 2,943 — 2,943 
Total financial liabilities$5,525 $2,943 $— $8,468