UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash Flows From Operating Activities:
Net Loss	$ (1,605)	$ (1,515)
Adjustments To Reconcile Net Loss To Net Cash Used In Operating Activities:
Depreciation and Amortization	511	539
Stock-based Compensation	479	445
Write-off of Inventory	0	178
Non-cash Lease Expense from Right of Use Assets	512	518
Amortization of Debt Financing Costs and Accretion of Debt Discount and Premium	88	88
Loss on Disposal of Assets	178	54
Realized Gain on Sale of Investments	(120)	(56)
Changes in Assets and Liabilities:
Accounts Receivable	(682)	(1,379)
Inventory	369	733
Prepaid and Other Assets	426	378
Accounts Payable	1,446	(944)
Lease Liabilities	(306)	(389)
Accrued and Other Liabilities	(1,463)	(1,662)
Deferred License Revenue	0	(475)
Net Cash Used In Operating Activities	(167)	(3,487)
Cash Flows From Investing Activities:
Purchases of Investments Available-for-Sale	(7,072)	(2,938)
Proceeds from Sales of Investments Available-for-Sale	7,200	3,000
Purchases of Equipment	(425)	(63)
Proceeds from Sale of Equipment	175	0
Net Cash Used In Investing Activities	(122)	(1)
Cash Flows From Financing Activities:
Payments on Insurance Financing Note Payable	(198)	(201)
Payments on Finance Lease Liabilities	(115)	(146)
Deferred Consideration Paid in Connection with Evoqua Asset Acquisition	(500)	(436)
Net Cash Used In Financing Activities	(813)	(783)
Net Decrease in Cash and Cash Equivalents	(1,102)	(4,271)
Cash and Cash Equivalents at Beginning of Period	10,711	15,662
Cash and Cash Equivalents at End of Period	9,609	11,391
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	193	190
Supplemental Disclosure of Noncash Investing and Financing Activities:
Right of Use Assets - Operating Obtained in Exchange for Lease Liabilities - Operating	2,450	0
Change in Unrealized Gain on Investments Available-for-Sale	$ 2	$ 5