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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 536 $ 670 $ 665
Expected losses 10 362 282
Write-offs, net of recoveries (117) (496) (277)
Balance at end of year $ 429 $ 536 $ 670