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Commitments and contingencies (Narrative) (Details)
 3 Months Ended
Nov. 02, 2021
item
Jul. 20, 2020
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Jun. 13, 2019
USD ($)
Mar. 31, 2022
USD ($)
item
Scenario Plan Date August 31, 2022 [Member]        
Number of chargers to be installed       58
Scenario Plan Date December 31, 2023 [Member]        
Percentage of chargers installation completed       72.00%
Nissan Agreement [Member]        
Number of chargers       850
Nissan Agreement 2.0 [Member]        
Joint marketing expense | $     $ 1,600,000  
Charging credits | $     $ 4,800,000  
Future build schedule penalty amount, per site | $       $ 35,000
Future build schedule penalty site maximum number       56
Nissan Agreement 2.0 [Member] | Scenario Plan Date February 29, 2024 [Member]        
Number of chargers to be installed       210
GM Agreement [Member]        
Number of chargers to be installed 3,250 2,750    
Number of chargers remaining to be installed       13
Contract term   5 years    
Charger station operational percentage benchmark       93.00%
Agreement liquidation damage amount if counterparty terminates | $       $ 15,000,000.0
Number of chargers installation completed       2,600
Number Of Chargers Installation In Construction Pipeline Stages       2,100
Number of additional chargers installation completed       363
GM Agreement [Member] | Scenario Plan Date December 31, 2025 [Member]        
Number of sites where chargers are installed       3,250