Receivables and Unbilled Receivables

12 Months Ended

Dec. 31, 2020

Receivables, net and unbilled receivables, net as of December 31, 2020 and 2019, respectively, were as follows (in thousands):


	2020		2019
Receivables, net	$	55,471	$	70,630
Unbilled receivables, net	22,358		46,279
Total	$	77,829	$	116,909

Receivables, net are recorded at face value less an allowance for credit losses of approximately $1.5 million and $396 thousand as of December 31, 2020 and 2019, respectively.

The allowance for credit loss is determined using a combination of specific reserves for accounts that are deemed to exhibit credit loss indicators and general reserves that are judgmental determined using loss rates based on historical write-offs and consideration of recent forecasted information, including underlying economic expectations. The credit loss reserves are updated quarterly for most recent write-offs and collections information and underlying expectations, which for the year ended December 31, 2020 included consideration of the current and expected future economic and market conditions surrounding the COVID-19 pandemic.

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 estimates	1,767
Write-offs	(441)
Recoveries	(229)
Balance as of December 31, 2020	$	1,493

The unbilled receivables balance includes certain costs for work performed at risk but which we believe will be funded by the government totaling approximately $2.6 million and $15.2 million as of December 31, 2020 and 2019, respectively. We expect to invoice substantially all unbilled receivables during 2021.