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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows From Operating Activities    
Net loss $ (2,444) $ (9,597)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 557 351
Stock compensation expense 446 725
Change in fair value of warrant liabilities (4,622) (7,522)
Change in fair value of convertible note (43)  
Accrued interest 497 24
Common stock issued in exchange for consulting services 168  
Amortization of debt discount   8,878
Changes in operating assets and liabilities:    
Accounts receivable (486) (783)
Prepaid expenses and other current assets (184) 142
Inventory (138)  
Other assets 22  
Accounts payable (769) (434)
Accrued expenses (560) (741)
Deferred revenue 675 410
Other current and noncurrent liabilities 398 195
Net cash used in operating activities (6,483) (8,352)
Cash Flows From Investing Activities    
Purchases and related costs incurred for Autonomous Security Robots (328) (764)
Purchase of property and equipment (439) (41)
Net cash used in investing activities (767) (805)
Cash Flows From Financing Activities    
Proceeds from stock options exercised 225 97
Proceeds from equity sale, net of issuance costs 4,694  
Offering proceeds, net of issuance costs   19,456
Share conversion costs (4) (50)
Net cash provided by financing activities 4,915 19,503
Net change in cash and cash equivalents (2,335) 10,346
Cash, cash equivalents and restricted cash at beginning of the period 4,810 21,195
Cash, cash equivalents and restricted cash at end of the period 2,475 10,849
Supplemental Disclosure of Non-Cash Financing Activities    
Conversion of preferred stock to common stock 1,090 17,247
Conversion of debt obligations to Class A Common Stock $ 4,174 $ 16,011