Accounts Receivable and Significant Concentrations (Details 1) - Sales Revenue, Net	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
U.S. Federal Government
Concentration risk	87.10%	94.00%	84.20%	91.40%
U.S. State & Local and Foreign Governments
Concentration risk	0.30%	0.10%	0.40%	0.10%
Commercial
Concentration risk	12.60%	5.90%	15.40%	8.50%

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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