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Significant Accounting Policies Concentration of Credit Risks (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Customer	four	four
Concentration Risk, Percentage	46.80%	50.30%
Revenue Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Customer	two	two
Concentration Risk, Percentage	29.30%	24.50%

X

- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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