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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Revenue from Contracts with Customers (Details)	3 Months Ended			9 Months Ended
Revenue from Contracts with Customers (Details)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Segment Reporting, Disclosure of Major Customers	21		19	20	17
Concentration Risk [Line Items]
Segment Reporting, Disclosure of Major Customers	21		19	20	17
Credit Concentration Risk [Member] \| Accounts Receivable \| U.S. government agencies
Revenue from Contract with Customer [Abstract]
Concentration Risk, Percentage		13.00%		17.00%
Concentration Risk [Line Items]
Concentration Risk, Percentage		13.00%		17.00%