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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (3,148) $ (6,754)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 755 776
Stock-based compensation 1,307 1,171
Change in fair value of warrant liability (658)
Allowance for bad debt (183)
Accrued interest (6) 22
Other 5 130
Changes in assets and liabilities:    
Accounts receivable 546 331
Inventories 495 (698)
Prepaid expenses and other assets 474 (192)
Accounts payable (480) 4
Right-of-use assets 165 121
Lease liabilities - operating (147) (107)
Deferred revenue and other liabilities (539) (544)
Net cash used in operating activities (1,414) (5,740)
Cash flows from investing activities:    
Purchases of property and equipment (84) (76)
Purchases of intangible assets (20)
Proceeds from maturities of marketable securities 500 4,240
Purchases of marketable securities (497)
Net cash provided by investing activities 416 3,647
Cash flows from financing activities:    
Taxes paid to net share settle equity awards (9)
Repayment of financing lease (25)
Net cash used in financing activities (25) (9)
Net decrease in cash and cash equivalents (1,023) (2,102)
Cash and cash equivalents at beginning of period 1,828 5,893
Cash and cash equivalents at end of period 805 3,791
Supplemental disclosure:    
Recognition of right-of-use asset and lease liability 274
Unrealized gain/(loss) on securities $ 14 $ (37)