Quarterly report pursuant to Section 13 or 15(d)

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

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9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses as of beginning of period $ 5 $ 0
Increase in allowance 0 (5)
Allowance for credit losses as of end of period $ 5 $ 5