CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities:
Net Loss	$ (30,890)	$ (34,128)
Adjustments To Reconcile Net Loss To Net Cash Used In Operating Activities:
Depreciation and Amortization	834	788
Stock-based Compensation	475	4,952
Warrant Modification Expense	837	0
Increase in Inventory Reserves	305	1,271
Amortization of Right of Use Asset	1,455	1,865
Amortization of Debt Financing Costs and Accretion of Debt Discount	294	0
Loss on Disposal of Assets	7	5
Realized Loss on Sale of Investments Available-for-Sale	(8)	(30)
Foreign Currency Translation Adjustment	8	(1)
Changes in Assets and Liabilities:
Decrease in Insurance Receivable	0	371
Decrease in Accounts Receivable, net	32	2,777
(Increase) Decrease in Inventory	(1,306)	317
Decrease in Other Assets	76	934
Increase (Decrease) in Accounts Payable	1,136	(1,474)
Decrease in Settlement Payable	(104)	(313)
Decrease in Lease Liability	(1,439)	(1,803)
Increase (Decrease) in Other Liabilities	534	(532)
Decrease in Deferred License Revenue	(1,887)	(2,253)
Changes in Assets and Liabilities	(2,958)	(1,976)
Cash Used In Operating Activities	(29,641)	(27,254)
Cash Flows From Investing Activities:
Purchase of Investments Available-for-Sale	(29,307)	(41,678)
Sale of Investments Available-for-Sale	33,565	38,266
Purchase of Equipment	(1,046)	(588)
Purchase of Research and Development Licenses (Related Party)	0	(750)
Cash Provided By (Used in) Provided By Investing Activities	3,212	(4,750)
Cash Flows From Financing Activities:
Proceeds from Term Loan	22,500	0
Debt Issuance Costs	(1,343)	0
Payments on Short Term Note Payable	(763)	(1,145)
Proceeds from the Exercise of Employee Stock Options, Net of Tax	0	148
Repurchase of Common Stock to Pay Employee Withholding Taxes	(19)	(279)
Cash Provided By Financing Activities	63,316	21,085
Increase (Decrease) In Cash and Cash Equivalents	36,887	(10,919)
Cash and Cash Equivalents At Beginning Of Period	11,795	22,714
Cash and Cash Equivalents At End Of Period	48,682	11,795
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	1,558	0
Supplemental Disclosure of Noncash Investing Activities:
Change in Unrealized Loss on Marketable Securities Available-for-Sale	(3)	(10)
Insurance Financing Note Payable	0	763
Fair Value of Warrants issued related to Debt Financing	501	0
Public offering
Cash Flows From Financing Activities:
Proceeds from the Issuance of Common Stock	43,148	18,778
Offering Costs from the Issuance of Common Stock	(2,469)	(1,490)
At -the-market
Cash Flows From Financing Activities:
Proceeds from the Issuance of Common Stock	2,325	5,383
Offering Costs from the Issuance of Common Stock	$ (63)	$ (310)