Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Revenue from contracts with customers - Summary of the Disaggregation of the Group's Revenue from Contracts with Customers (Detail)

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Revenue from contracts with customers - Summary of the Disaggregation of the Group's Revenue from Contracts with Customers (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers € 145,453 € 133,900 € 86,291
Services transferred over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 32,337 34,968 22,930
Goods and services transferred at a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 113,116 98,932 63,361
Charging sessions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 103,265 65,347 26,108
Service revenue from the sale of charging equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 10,303 33,585 37,253
Service revenue from installation services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 20,391 28,630 19,516
Service revenue from operation and maintenance of charging equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 5,399 3,230 3,414
Service revenue from consulting services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers € 6,095 € 3,108 € 0