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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash Flows From Operating Activities    
Net loss $ (13,226) $ (13,863)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,295 1,280
Loss on disposal of Autonomous Security Robots 36 1,075
(Gain)/Loss on disposal of property and equipment (17) 1
Stock compensation expense 807 603
Warrants issued in exchange for consulting services 43  
Change in fair value of warrant and derivative liabilities   (1,451)
Accrued interest 210 159
Amortization of debt discount 39 31
Changes in operating assets and liabilities:    
Accounts receivable, net (760) (1,418)
Prepaid expenses and other assets (413) 170
Inventory 55 (922)
Accounts payable (350) 757
Accrued expenses and other current liabilities 303 566
Deferred revenue (62) 547
Other current and noncurrent liabilities 175 (177)
Net cash used in operating activities (11,865) (12,642)
Cash Flows From Investing Activities    
Purchases and related costs incurred for Autonomous Security Robots (1,005) (1,759)
Purchases of property and equipment (181) (4)
Net cash used in investing activities (1,186) (1,763)
Cash Flows From Financing Activities    
Proceeds from stock options exercised   18
Proceeds from equity sale, net of issuance costs 10,274 12,089
Proceeds from issuance of Public Safety Infrastructure Bonds, net of issuance costs   2,644
Proceeds from Direct Registration Offering 1,436  
Repayments of debt obligations (1,674)  
Share conversion costs   (2)
Net cash provided by financing activities 10,036 14,749
Net change in cash, cash equivalents and restricted cash (3,015) 344
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 8,211 2,726
Supplemental Disclosure of Cash Flow Information    
Capital expenditures in accounts payable and other long-term liabilities 22 27
Preferred stock warrant reclassification to equity   4,762
Operating lease liabilities arising from obtaining right-of-use-assets 2,901  
Financing of insurance premiums $ 591  
Conversion of preferred stock to common stock   $ 34,203