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
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer			3 Months Ended		6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Concentration Risk [Line Items]
Number of customers					460
Accounts Receivable, Net, Less Deferred Revenue \| Credit Concentration Risk \| Customer A
Concentration Risk [Line Items]
Concentration risk, percentage of total	12.00%	15.00%
Accounts Receivable, Net, Less Deferred Revenue \| Credit Concentration Risk \| Customer B
Concentration Risk [Line Items]
Concentration risk, percentage of total		12.00%
Revenue \| Customer Concentration Risk \| Ten Largest Customers
Concentration Risk [Line Items]
Concentration risk, percentage of total			55.00%	66.00%	60.00%	63.00%