Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT ACCOUNTING POLICIES - Allowance for Credit Losses (Details)

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SIGNIFICANT ACCOUNTING POLICIES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 1,497 $ 1,049 $ 100
Provision for credit losses during the period—net 282 448 949
Write-off during the period (1,562) 0 0
Ending balance $ 217 $ 1,497 $ 1,049