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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 1,049 $ 100 $ 443
Provision for credit losses during the period 4,291 949 114
Provision for credit losses no longer required (3,843) 0 (457)
Ending balance $ 1,497 $ 1,049 $ 100