Unbilled Accounts Receivable (Details) - Unbilled Accounts Receivable	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
U.S. Federal Government
Concentration risk	99.00%	99.00%
Commercial
Concentration risk	1.00%	1.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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