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Commitments - Commitments related to financing activities (Details) € in Thousands, $ in Thousands		1 Months Ended
	Dec. 31, 2020 USD ($) contract	Sep. 30, 2020 item	Dec. 31, 2020 EUR (€)
Disclosure of detailed information about financial instruments [line items]
Number Of Derivative Contracts Completed	3	2
Notional amount	$ 60,000
Change in fair value of future currency contracts	$ 60,000
Foreign currency forwards
Disclosure of detailed information about financial instruments [line items]
Number Of Derivative Contracts Completed | contract	3
Notional amount	$ 60,000
Change in fair value of future currency contracts | €			€ 1,800
Socit Gnrale | Forward in U.S. dollars payable
Disclosure of detailed information about financial instruments [line items]
Notional amount	20,000,000
Socit Gnrale | Forward in U.S. dollars payable
Disclosure of detailed information about financial instruments [line items]
Notional amount	20,000,000
Socit Gnrale | Forward in euros to be received
Disclosure of detailed information about financial instruments [line items]
Notional amount | €			16,794,021
Socit Gnrale | Forward in euros to be received
Disclosure of detailed information about financial instruments [line items]
Notional amount | €			16,794,021
Crdit Agricole bank | Forward in U.S. dollars payable
Disclosure of detailed information about financial instruments [line items]
Notional amount	$ 20,000,000
Crdit Agricole bank | Forward in euros to be received
Disclosure of detailed information about financial instruments [line items]
Notional amount | €			€ 17,001,020

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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Amount of change in fair value of derivatives as of the reporting date recorded in other current liabilities.

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