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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (9,168) $ (7,857)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,964 2,764
Stock-based compensation 3,337 3,933
Change in fair value of warrant liabilities (1,649) (4,239)
Shares issued for services 54
Allowance for bad debt (154)
Other (8) (14)
Changes in assets and liabilities    
Accounts receivable (60) 334
Inventories 103 (348)
Prepaid expenses and other assets (15) (164)
Deferred cost of net revenue 600
Accounts payable (743) 739
Right-of-use assets 260 500
Lease liabilities - operating (205) (335)
Deferred revenue, accrued expenses and other 1,238 (1,386)
Net cash used in operating activities (3,892) (5,627)
Cash flows from investing activities:    
Purchases of property and equipment (93)
Proceeds from maturities of marketable securities 1,100
Net cash provided by investing activities 1,007
Cash flows from financing activities:    
Proceeds from sale of common stock and warrants, net 3,559 3,595
Proceeds from at-the-market sales of stock, net 164
Taxes paid to net share settle equity awards (3) (36)
Repayment of financing leases (94) (78)
Net cash provided by financing activities 3,626 3,481
Net decrease in cash and cash equivalents (266) (1,139)
Cash and cash equivalents at beginning of period 1,583 1,828
Cash and cash equivalents at end of period 1,317 689
Noncash investing and financing activities:    
Initial recognition of warrant liability 3,162
Unrealized gain on available-for-sale securities $ (25)