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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash Flows From Operating Activities    
Net loss $ (7,592) $ (2,444)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 629 557
Stock compensation expense 334 446
Change in fair value of warrant and derivative liabilities (770) (4,622)
Change in fair value of convertible notes   (43)
Accrued interest 50 497
Common stock issued in exchange for consulting services   168
Amortization of debt discount 12  
Loss on disposal of property and equipment 1  
Loss on disposal of Autonomous Security Robots 768  
Changes in operating assets and liabilities:    
Accounts receivable, net (1,004) (486)
Prepaid expenses and other current assets 64 (184)
Inventory (563) (138)
Other assets   22
Accounts payable (359) (769)
Accrued expenses 27 (560)
Deferred revenue (82) 675
Other current and noncurrent liabilities (126) 398
Net cash used in operating activities (8,611) (6,483)
Cash Flows From Investing Activities    
Purchases and related costs incurred for Autonomous Security Robots (894) (328)
Purchase of property and equipment   (439)
Net cash used in investing activities (894) (767)
Cash Flows From Financing Activities    
Proceeds from stock options exercised   225
Proceeds from equity sale, net of issuance costs 7,067 4,694
Proceeds from issuance of REG A Bonds, net of issuance costs 2,644  
Share conversion costs (1) (4)
Net cash provided by financing activities 9,710 4,915
Net change in cash, cash equivalents and restricted cash 205 (2,335)
Cash, cash equivalents and restricted cash at beginning of the period 2,382 4,810
Cash, cash equivalents and restricted cash at end of the period 2,587 2,475
Supplemental Disclosure of Non-Cash Financing Activities    
Conversion of preferred stock to common stock $ 188 1,090
Conversion of debt obligations to Class A Common Stock   $ 4,174