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Summary of significant accounting policies - Concentration of risk (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 item	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 item	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Trade accounts receivable, net	$ 64,151		$ 64,151		$ 46,513
Revenue from Contract with Customer Benchmark [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of significant distributors | item	2	1	2	1
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Trade accounts receivable, net	$ 15,200		$ 15,200		$ 6,000

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- Definition

The number of distributors that accounted for more than 10% of total revenues during the period.

+ References

No definition available.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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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