Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Allowance for Credit Losses (Details)

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12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses as of January 1 $ 0 $ 0
Increase in allowance (5) 0
Allowance for credit losses as of December 31 $ (5) $ 0