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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers € 86,291 € 44,249 € 25,822
Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 22,930 14,162 7,160
Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 63,361 30,087 18,662
Charging Sessions [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 26,108 14,879 9,515
Service Revenue From The Sale Of Charging Equipment [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 37,253 15,207 9,147
Service Revenue From Installation Services [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 19,516 12,313 6,880
Service Revenue From Operation And Maintenance of Charging Equipment [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers € 3,414 € 1,850 € 280