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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (2,031) $ (3,148)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 992 755
Stock-based compensation 1,222 1,307
Change in fair value of warrant liabilities (1,591) (658)
Inventory write-downs 369
Allowance for bad debt (183)
Accrued interest on debt obligation (3) (6)
Other (5) 5
Changes in assets and liabilities    
Accounts receivable (750) 546
Inventories (146) 126
Prepaid expenses and other assets (173) 474
Tax credits and receivables 9
Accounts payable (226) (480)
Right-of-use assets 91 165
Lease liabilities - operating (80) (147)
Deferred revenue and other liabilities 141 (539)
Net cash used in operating activities (2,550) (1,414)
Cash flows from investing activities:    
Purchases of property and equipment (84)
Proceeds from maturities of marketable securities 500
Net cash provided by investing activities 416
Cash flows from financing activities:    
Proceeds from sale of common stock and warrants, net 3,432
Repayment of financing lease (30) (25)
Net cash provided by (used in) financing activities 3,402 (25)
Net increase (decrease) in cash and cash equivalents 852 (1,023)
Cash and cash equivalents at beginning of period 1,583 1,828
Cash and cash equivalents at end of period 2,435 805
Noncash investing and financing activities:    
Unrealized gain on available-for-sale securities $ 14