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Allowance for Credit Losses
3 Months Ended
Mar. 31, 2020
Receivables [Abstract]  
Allowance for Credit Losses Allowance for Credit Losses
An analysis of the allowance for credit losses is as follows (in thousands):
Three months ended March 31, 2020
Beginning Balance January 1, 2020$34  
Write-offs charged against the allowance—  
Recoveries of amounts previously written off—  
Ending Balance March 31, 2020$34  

The following tables below summarizes accounts receivable by aging category (in thousands):
March 31, 2020
31-60 Days61-90 Days91 days and overTotal over 31 daysCurrentTotal balance
Accounts receivable$745  $—  $40  $785  $7,599  $8,384  

December 31, 2019
31-60 Days61-90 Days91 days and overTotal over 31 daysCurrentTotal balance
Accounts receivable$185  $ $65  $257  $8,806  $9,063