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
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Significant risks and uncertainties including business and credit concentrations (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) customer	Jun. 30, 2021 customer	Jun. 30, 2022 USD ($) customer	Jun. 30, 2021 customer	Dec. 31, 2021 USD ($) customer
Concentration Risk [Line Items]
Allowance for doubtful accounts \| $	$ 45		$ 45		$ 45
Revenue from Contract with Customer Benchmark \| Customers
Concentration Risk [Line Items]
Number of customers with concentration risk	1	1	0	0
Revenue from Contract with Customer Benchmark \| Customers \| One Customer
Concentration Risk [Line Items]
Concentration Risk, Percentage	13.00%	12.00%
Accounts Receivable. \| Customers
Concentration Risk [Line Items]
Number of customers with concentration risk			1		0
Accounts Receivable. \| Customers \| One Customer
Concentration Risk [Line Items]
Concentration Risk, Percentage			18.00%