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Receivables and Unbilled Receivables (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Components of Receivables
Receivables, net and unbilled receivables, net as of December 31, 2020 and 2019, respectively, were as follows (in thousands):
 20202019
Receivables, net$55,471 $70,630 
Unbilled receivables, net22,358 46,279 
Total$77,829 $116,909 
Allowance for Credit Losses
A summary of activity in our allowance for credit losses for the year ended December 31, 2020 is as follows (in thousands):

Balance as of December 31, 2019$396 
Change in estimates1,767 
Write-offs(441)
Recoveries(229)
Balance as of December 31, 2020$1,493