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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of fair value of impaired notes receivable
 LevelJune 30,
2021
December 31,
2020
Cash equivalents2$67,155 $177,912 
Marketable securities2$57,357 $— 
Notes receivable2$5,906 $2,937 
Notes receivable impaired3$— $875 
Accounts receivable2$4,377 $3,901