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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2021
Intangible assets other than goodwill [abstract]  
Schedule of intangible assets
The change in intangible assets breaks down as follows:

(in thousands of euros)As of As of January 1, 2021IncreasesDecreases
Transfer
Currency
translation		As of December 31, 2021
Patents65 — — — — 65 
Software651 5 — — — 657 
Intangible assets in progress— — — — — — 
Gross book value of intangible assets717 5 — — — 722 
Patents(65)— — — — (65)
Software(630)(22)— — — (652)
Accumulated depreciation of intangible assets (1)
(695)(22)— — — (717)
Net book value of intangible assets21 (17)— — — 4 
(1)Expenses for the period are detailed in Note 16.4 Depreciation, amortization and provisions expenses
(in thousands of euros)As of January 1, 2020IncreasesDecreases
Transfer
Currency
translation		As of December 31, 2020
Patents65 — — — — 65 
Software584 11 (5)61 — 651 
Intangible assets in progress61 — — (61)— — 
Gross book value of intangible assets710 11 (5)— — 717 
Patents(65)— — — — (65)
Software(483)(152)5 (0)(0)(630)
Accumulated depreciation of intangible assets (1)
(548)(152)5 — — (695)
Net book value of intangible assets163 (141)— (0)(0)21 
(1)Expenses for the period are detailed in Note 16.4 Depreciation, amortization and provisions expenses