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The Company and Summary of Significant Accounting Policies - Components of the Finished ASRs (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
The Company and Summary of Significant Accounting Policies    
ASRs on lease or available for lease $ 8,494 $ 10,804
Demonstration ASRs 470 607
Research and development ASRs 67 194
Charge boxes 566 525
Finished ASRs, gross 9,597 12,130
Less: accumulated depreciation (6,011) (8,701)
Finished ASRs, net $ 3,586 $ 3,429