Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating activities:
Net loss	$ (26,745)	$ (36,780)
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	130	21
Inventory reserve	4,549	323
Depreciation and amortization	6,578	5,660
Stock-based compensation	3,666	4,137
Deferred taxes	(92)	(304)
Accrued interest income on short-term investments	(69)	0
Amortization of discount on short-term investments	(344)	0
Amortization of debt financing costs	394	498
Non-cash lease expense	182	137
Loss on disposal of property, plant, and equipment	233	57
Tradename impairment	0	2,169
Long-lived assets impairment	0	2,195
Loss on extinguishment of debt	0	824
Changes in operating assets and liabilities:
Accounts receivable	(494)	292
Inventories	244	330
Income taxes receivable	0	22
Prepaid expenses and other current assets	(18)	131
Other non-current assets	470	400
Accounts payable	(594)	(773)
Accrued liabilities	(389)	1,936
Other	(92)	(89)
Cash used in operating activities	(12,391)	(18,814)
Investing activities:
Purchases of short-term investments	(30,275)	0
Maturities of short-term investments	4,000	0
Proceeds from sale of property, plant, and equipment	125	197
Purchase of property, plant and equipment	(1,125)	(7,934)
Cash used in investing activities	(27,275)	(7,737)
Financing activities:
Proceeds from equity financing, net	15,104	22,503
Repayment of long-term debt	0	(10,000)
Proceeds from financed insurance premiums	385	1,004
Repayment of financed insurance premiums	(738)	(594)
Payment of debt issuance costs	(25)	(47)
Payment of at-the-market facility costs	0	(395)
Proceeds from exercise of stock options	29	76
Proceeds from issuance of common stock under employee stock purchase plan	135	252
Cash provided by financing activities	14,890	12,799
Change in cash and cash equivalents	(24,776)	(13,752)
Cash and cash equivalents at beginning of period	28,484	42,236
Cash and cash equivalents at end of period	3,708	28,484
Supplemental cash flow disclosures:
Income taxes paid	39	0
Interest paid, net of amounts capitalized	1,552	1,749
Offering costs included in accounts payable	0	37
Capitalized property, plant and equipment included in accounts payable and accrued liabilities	104	51
Recognition of operating right-of-use lease asset	1,293	(1,137)
Recognition of operating lease liabilities	$ 1,306	$ (1,193)