Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value of impaired notes receivable (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value of impaired notes receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 41,372 $ 177,912
Marketable securities 39,793 0
Fair Value, Inputs, Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable impaired $ 978 $ 874