Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Financial Assets not Measured at Fair Value on a Recurring Basis (Details)

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FAIR VALUE MEASUREMENT - Financial Assets not Measured at Fair Value on a Recurring Basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets $ 9,322 $ 11,399
Carrying Value | Level 3 | Receivables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable 72 8
Carrying Value | Level 3 | Other long-term assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable 1,250 3,391
Prepaid expenses - non-current 8,000 8,000
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets 9,322 11,399
Estimated Fair Value | Level 3 | Receivables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable 72 8
Estimated Fair Value | Level 3 | Other long-term assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable 1,250 3,391
Prepaid expenses - non-current $ 8,000 $ 8,000