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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows From Operating Activities    
Net loss $ (6,897) $ (7,592)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 656 629
Loss on disposal of Autonomous Security Robots   768
Loss on disposal of property and equipment   1
Stock compensation expense 422 334
Warrants issued in exchange for consulting services 10  
Change in fair value of warrant and derivative liabilities   (770)
Accrued interest 105 50
Amortization of debt discount 19 12
Changes in operating assets and liabilities:    
Accounts receivable, net (283) (1,004)
Prepaid expenses and other assets 145 64
Inventory 190 (563)
Accounts payable (552) (359)
Accrued expenses and other current liabilities 376 (75)
Deferred revenue (540) (82)
Other current and noncurrent liabilities (26) (24)
Net cash used in operating activities (6,375) (8,611)
Cash Flows From Investing Activities    
Purchases and related costs incurred for Autonomous Security Robots (449) (894)
Net cash used in investing activities (449) (894)
Cash Flows From Financing Activities    
Proceeds from equity sale, net of issuance costs 7,411 7,067
Proceeds from issuance of Public Safety Infrastructure Bonds, net of issuance costs   2,644
Proceeds from issuance of common stock and pre-funded warrants sold for cash, net of issuance costs 1,436  
Repayments of debt obligations (588)  
Share conversion costs   (1)
Net cash provided by financing activities 8,259 9,710
Net change in cash, cash equivalents and restricted cash 1,435 205
Cash, cash equivalents and restricted cash at beginning of the period 11,226 2,382
Cash, cash equivalents and restricted cash at end of the period 12,661 2,587
Supplemental Disclosure of Non-Cash Financing and Investing Activities    
Financing of insurance premiums $ 591  
Conversion of preferred stock to common stock   $ 188