Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Schedule of fair value of impaired notes receivable (Details)

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FAIR VALUE MEASUREMENTS - Schedule of fair value of impaired notes receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 47,273 $ 41,372
Marketable securities 19,035 39,793
Fair Value, Inputs, Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 47,273 41,372
Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities $ 19,035 $ 39,793