UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities:
Net Loss	$ (7,162)	$ (7,752)
Adjustments To Reconcile Net Loss To Net Cash Used In Operating Activities:
Depreciation and Amortization	138	202
Stock-based Compensation	(179)	(236)
Increase in Inventory Reserves	0	71
Amortization of Right of Use Asset	520	412
Amortization of Debt Financing Costs and Accretion of Debt Discount	92	92
Loss on Disposal of Assets	0	6
Realized Gain on Sale of Investments Available-for-Sale	(4)	0
Foreign Currency Translation Adjustment	(1)	3
Changes in Assets and Liabilities:
Increase in Accounts Receivable, net	(1,208)	(2,426)
Increase in Inventory	(1,455)	(424)
Decrease in Prepaid and Other Assets	630	317
Increase (Decrease) in Accounts Payable	485	(848)
Decrease in Lease Liability	(490)	(410)
Decrease in Other Liabilities	(640)	(958)
Decrease in Deferred License Revenue	(538)	(544)
Changes in Assets and Liabilities	(3,216)	(5,293)
Cash Used In Operating Activities	(9,812)	(12,495)
Cash Flows From Investing Activities:
Purchase of Investments Available-for-Sale	(2,810)	(7,212)
Sale of Investments Available-for-Sale	11,972	6,738
Purchase of Equipment	(29)	(38)
Cash Provided By (Used In) Investing Activities	9,133	(512)
Cash Flows From Financing Activities:
Payments on Debt	(2,250)	0
Payments on Short Term Note Payable	(437)	0
Cash Used In Financing Activities	(2,687)	0
Decrease in Cash and Cash Equivalents	(3,366)	(13,007)
Cash and Cash Equivalents at Beginning of Period	13,280	48,682
Cash and Cash Equivalents at End of Period	9,914	35,675
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	461	485
Supplemental Disclosure of Noncash Investing and Financing Activities:
Change in Unrealized Loss on Marketable Securities Available-for-Sale	$ 0	$ (7)