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FAIR VALUE MEASUREMENT (Tables)
 6 Months Ended
Jun. 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 June 30, 2021 and December 31, 2020:
June 30, 2021
Carrying ValueEstimated Fair ValueFair Value HierarchyFinancial Statement Line Item
Financial assets:
Notes receivable - current$2,320 $2,320 Level 3Receivables
Notes receivable - non-current3,091 3,091 Level 3Other long-term assets
Total financial assets$5,411 $5,411 
December 31, 2020
Carrying ValueEstimated Fair ValueFair Value HierarchyFinancial Statement Line Item
Financial assets:
Notes receivable - non-current$815 $815 Level 3Other long-term assets
Total financial assets$815 $815 
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 June 30, 2021:
June 30, 2021
Level 1Level 2Level 3Total
Financial liabilities:
Public Warrants$13,274 — — 13,274 
Private Warrants— 7,070 — 7,070 
Total financial liabilities$13,274 $7,070 $— $20,344