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Summary of significant accounting policies, Revenue recognition - Contract balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Summary of significant accounting policies [Abstract]
Revenue recognized	$ 700
Contract liabilities [Abstract]
Unbilled receivables, current	290	$ 314
Unbilled receivables, non-current	591	308
Customer pre-payments	(216)	(99)
Deferred revenue, current	(504)	(805)
Deferred revenue, non-current	(111)	(186)
Net contract assets (liabilities)	$ 50	$ (468)

X

- Definition

Amount, after allowance for credit loss, of right (asset) to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time and the amount of obligation (liability) to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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- Definition

Amount of obligation to transfer good or service to customer related to customer prepayments for which consideration has been received or is receivable, classified as current.

+ References

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

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