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Summary of significant accounting policies, Concentration of credit risk (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable [Member] | Chain Link Services [Member]
Concentration of credit risk [Abstract]
Concentration risk percentage	10.00%	0.00%
Accounts Receivable [Member] | IGT [Member]
Concentration of credit risk [Abstract]
Concentration risk percentage	3.00%	11.00%
Accounts Receivable [Member] | NCR Corporation [Member]
Concentration of credit risk [Abstract]
Concentration risk percentage	11.00%	2.00%
Sales [Member] | IGT [Member]
Concentration of credit risk [Abstract]
Concentration risk percentage	9.00%	15.00%

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- References

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