XML 98 R74.htm IDEA: XBRL DOCUMENT
v3.21.1

Accounting Principles - Foreign currency transactions and Segment information (Details) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 EUR (€)
Accounting Principles |
Foreign currency expense amount | € 2.5
Foreign currency expenses as a percentage of operating expenses | 7.00%

X
- References No definition available. + Details
Name: | iva_AccountingPrinciplesAbstract
Namespace Prefix: | iva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amounts of purchases made in foreign currency, translated to the reporting currency. + References No definition available. + Details
Name: | iva_AmountOfPurchasesInForeignCurrencyTranslatedToReportingCurrency
Namespace Prefix: | iva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage amount of operating expenses that were paid in a currency other than the reporting currency. + References No definition available. + Details
Name: | iva_PurchasesInForeignCurrencyAsPercentageOfOperatingExpenses
Namespace Prefix: | iva_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration