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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (6,456) $ (7,234)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,983 1,713
Stock-based compensation 2,377 2,626
Change in fair value of warrant liabilities (1,645) (1,624)
Allowance for bad debt (154)
Other (7) (7)
Changes in assets and liabilities    
Accounts receivable (729) 1,900
Inventories 189
Prepaid expenses and other assets (187) 485
Accounts payable (130) (702)
Right-of-use assets 174 332
Lease liabilities - operating (144) (285)
Deferred revenue and other liabilities 1,555 (813)
Net cash used in operating activities (3,209) (3,574)
Cash flows from investing activities:    
Purchases of property and equipment (91)
Proceeds from maturities of marketable securities 500
Net cash provided by investing activities 409
Cash flows from financing activities:    
Proceeds from sale of common stock and warrants, net 3,559 3,570
Taxes paid to net share settle equity awards (4) (36)
Repayment of financing leases (61) (51)
Net cash provided by financing activities 3,494 3,483
Net increase in cash and cash equivalents 285 318
Cash and cash equivalents at beginning of period 1,583 1,828
Cash and cash equivalents at end of period 1,868 2,146
Noncash investing and financing activities:    
Initial recognition of warrant liability 3,162
Unrealized gain on available-for-sale securities $ 21