Annual report pursuant to Section 13 and 15(d)

ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details)

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ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
ACCOUNTS RECEIVABLE    
Balance at beginning of period $ 500 $ 199
Provision for uncollectible accounts, net of recoveries 447 377
Uncollectible accounts written off (282) (76)
Balance at end of period $ 665 $ 500