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The Company and Summary of Significant Accounting Policies - Components of the Finished ASRs (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
The Company and Summary of Significant Accounting Policies    
ASRs on lease or available for lease $ 10,804 $ 9,002
Demonstration ASRs 607 622
Research and development ASRs 194 194
Charge boxes 525 380
Finished ASRs, gross 12,130 10,198
Less: accumulated depreciation (8,701) (7,853)
Finished ASRs, net $ 3,429 $ 2,345