Concentrations of Credit Risk and Major Customers (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) Customer	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017
Concentration Risk
Concentration of risk, number of customers	5
Concentration Risk, Percentage	36.00%	37.00%	38.00%
Sales Revenue and Services, Net [Member] \| Customer Concentration Risk [Member]
Concentration Risk
Concentration of risk, number of customers	1	1
Concentration Risk, Percentage	10.90%	12.50%	12.60%
Baseline percentage for customer concentration of risk	10.00%	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Concentration Risk
Accounts receivable \| $	$ 5.8	$ 6.7
Concentration Risk, Percentage	30.00%	36.00%

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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