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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities    
Net loss $ (27,879) $ (21,190)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 777 614
Noncash lease expense 51 (11)
Stock-based compensation expense 3,209 1,933
Amortization of debt discount 289 273
Change in fair value of warrant liability 417  
Loss on disposal of property and equipment and recorders 82 152
Changes in operating assets and liabilities:    
Accounts receivable, net (2,018) (1,581)
Inventory (1,041) (2,076)
Prepaid expenses and other current assets (137) (681)
Contract costs (298) (725)
Other non-current asset (65) (22)
Accounts payable 1,153 848
Accrued liabilities and other current liabilities 504 85
Contract liabilities (112) (103)
Net cash used in operating activities (25,068) (22,484)
Cash flows from investing activities    
Purchases of recorder components and recorders (122) (574)
Purchases of property and equipment (983) (506)
Net cash used in investing activities (1,105) (1,080)
Cash flows from financing activities    
Proceeds from exercise of common stock pursuant to stock option exercises 940 644
Proceeds from debt issuance 7,905  
Debt issuance cost (304)  
Payment of deferred IPO offering costs (2,753)  
Net cash provided by financing activities 5,788 644
Net decrease in cash and cash equivalents (20,385) (22,920)
Cash and cash equivalents, beginning of period 34,495 68,235
Cash and cash equivalents, end of period 14,110 45,315
Supplemental Cash Flow Information [Abstract]    
Cash paid for interest 1,194 1,313
Right-of-use asset obtained in exchange for operating lease obligation 778  
Property and equipment included in accounts payable and accrued expenses 178 79
Recorder components included in accounts payable and accrued expenses 61 $ 26
Unpaid deferred IPO offering costs included in accounts payable and accrued liabilities $ 1,142