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The Company and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
The Company and Summary of Significant Accounting Policies |
Schedule of Inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Raw materials | ​ | $ | 2,112 | ​ | $ | 2,032
Work in process | ​ |  | 82 | ​ |  | —
Finished goods | ​ |  | 126 | ​ |  | 528
​ | ​ | $ | 2,320 | ​ | $ | 2,560
Schedule of prepaid expenses and other current assets | Prepaid and other current assets is comprised of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Prepaid inventory | ​ | $ | 123 | ​ | $ | 66
Prepaid expense | ​ |  | 488 | ​ |  | 901
Other receivables | ​ |  | 362 | ​ |  | —
Research and development tax credit | ​ |  | 376 | ​ |  | 376
Other current assets | ​ |  | 72 | ​ |  | 6
​ | ​ | $ | 1,421 | ​ | $ | 1,349
Schedule of ASRs, net and components of the Finished ASRs, net | ASRs, net, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Raw materials | ​ | $ | 3,841 | ​ | $ | 2,732
ASRs in progress | ​ |  | 1,575 | ​ |  | 773
Finished ASRs | ​ |  | 12,130 | ​ |  | 10,198
​ | ​ |  | 17,546 | ​ |  | 13,703
Accumulated depreciation on Finished ASRs | ​ |  | (8,701) | ​ |  | (7,853)
ASRs, net | ​ | $ | 8,845 | ​ | $ | 5,850
​ The components of the Finished ASRs, net, are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
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
​ | ​ |  | 12,130 | ​ | ​ | 10,198
Less: accumulated depreciation | ​ |  | (8,701) | ​ | ​ | (7,853)
Finished ASRs, net | ​ | $ | 3,429 | ​ | $ | 2,345
​
Schedule of property, equipment, and software, net | Property, equipment, and software, net as of December 31, 2023 and 2022 were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31
​ | ​ | 2023 |  | 2022
Computer equipment | ​ | $ | 258 | ​ | $ | 258
Software | ​ |  | 8 | ​ |  | 8
Furniture, fixtures and equipment | ​ |  | 1,245 | ​ |  | 788
Leasehold improvements | ​ |  | 46 | ​ |  | 46
​ | ​ |  | 1,557 | ​ |  | 1,100
Accumulated depreciation and amortization | ​ |  | (700) | ​ |  | (486)
Property, equipment and software, net | ​ | $ | 857 | ​ | $ | 614
​
Schedule of Other current liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2023 | ​ | 2022
Sales tax | ​ | $ | 364 | ​ | $ | 419
Customer and vendor deposits | ​ |  | 239 | ​ |  | 50
Warranty liability | ​ |  | 406 | ​ |  | 145
Other | ​ |  | 460 | ​ |  | 449
​ | ​ | $ | 1,469 | ​ | $ | 1,063
Schedule of change in the warranty liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022
Balance January 1, | ​ | $ | 145 | ​ | $ | —
Provision for warranties issued during the year | ​ |  | 675 | ​ |  | 288
Warranty services provided | ​ |  | (414) | ​ |  | (143)
​ | ​ | $ | 406 | ​ | $ | 145
Schedule of Accrued Expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2023 | ​ | 2022
Accrued bonuses | ​ | $ | — | ​ | $ | 961
Payroll and payroll taxes | ​ |  | 604 | ​ |  | 696
Legal, consulting, and financial services | ​ |  | 117 | ​ |  | 542
Credit cards | ​ | ​ | 244 | ​ | ​ | 188
Other | ​ |  | 180 | ​ |  | 16
​ | ​ | $ | 1,145 | ​ | $ | 2,403
Schedule of deferred revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |  | December 31, 2022
Deferred revenue - short term | ​ | $ | 1,741 | ​ | $ | 1,711
Revenue recognized in the year ended related to amounts included in deferred revenue at the beginning of the period | ​ | $ | 1,466 | ​ | $ | 657
Summary of revenue by product line and timing of recognition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31
​ | ​ | 2023 | ​ | 2022
​ |  | Point in time |  | Over time |  | Total |  | Point in time |  | Over time |  | Total
ASRs | ​ | $ | 153 | ​ | $ | 4,036 | ​ | $ | 4,189 | ​ | $ | 77 | ​ | $ | 4,125 | ​ | $ | 4,202
ECDs | ​ | ​ | 8,330 | ​ | ​ | 278 | ​ |  | 8,608 | ​ | ​ | 1,370 | ​ | ​ | 59 | ​ |  | 1,429
Total | ​ | $ | 8,483 | ​ | $ | 4,314 | ​ | $ | 12,797 | ​ | $ | 1,447 | ​ | $ | 4,184 | ​ | $ | 5,631
Schedule of potentially dilutive securities that were excluded from the computation of diluted net loss per share | ​
​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022
Series A Preferred Stock (convertible to Class B Common Stock) |  | 1,418,381 |  | 3,086,160
Series B Preferred Stock (convertible to Class B Common Stock) |  | 3,498,859 |  | 3,535,621
Series m Preferred Stock (convertible to Class A Common Stock) |  | 1,779,653 |  | 1,855,328
Series m-2 Preferred Stock (convertible to Class B Common Stock) |  | 160,000 |  | 160,000
Series S Preferred Stock (convertible to Class A Common Stock) |  | 2,642,190 |  | 2,714,732
Warrants to purchase common stock (convertible to Class A Common Stock) | ​ | 1,138,446 | ​ | 1,138,446
Warrants to purchase Series m-3 (convertible to Class A Common Stock) |  | 1,432,786 |  | 1,432,786
Warrants to purchase Series s (convertible to Class A Common Stock) |  | 2,941,814 |  | 4,441,814
Convertible Notes |  | — |  | 5,189,351
Stock options |  | 10,069,394 |  | 10,081,915
Total potentially dilutive shares |  | 25,081,523 |  | 33,636,153

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