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Allowance for Credit Losses
 6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Allowance for Credit Losses Allowance for Credit Losses
The following table summarizes the financial assets allowance for credit losses (in thousands):
June 30, 2021December 31, 2020
Allowance for credit losses$74 74 
The following tables summarize accounts receivable by aging category (in thousands):
June 30, 2021
Current31-60 Days61-90 Days91 Days and overTotal balance
Accounts receivable$17,414 $83 $1,602 $389 $19,488 
December 31, 2020
Current31-60 Days61-90 Days91 Days and overTotal balance
Accounts receivable$13,398 $489 $7 $— $13,894