UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows From Operating Activities:
Net Loss	$ (16,152)	$ (14,876)
Adjustments To Reconcile Net Loss To Net Cash Used In Operating Activities:
Depreciation and Amortization	385	408
Stock-based Compensation	197	(526)
Warrant Modification Expense	0	837
Increase in Inventory Reserves	89	12
Amortization of Right of Use Asset	857	748
Amortization of Debt Financing Costs and Accretion of Debt Discount	184	108
Loss on Disposal of Assets	8	6
Realized Loss (Gain) on Sale of Investments Available-for-Sale	1	(4)
Foreign Currency Translation Adjustment	3	6
Changes in Assets and Liabilities:
(Increase) Decrease in Accounts Receivable, net	(1,186)	637
Increase in Inventory	(799)	(1,302)
Decrease (Increase) in Prepaid and Other Assets	1,293	(608)
Increase in Accounts Payable	777	295
Decrease in Settlement Payable	0	(104)
Decrease in Lease Liability	(839)	(703)
Decrease in Other Liabilities	(1,163)	(96)
Decrease in Deferred License Revenue	(1,088)	(992)
Changes in Assets and Liabilities	(3,005)	(2,873)
Cash Used In Operating Activities	(17,433)	(16,154)
Cash Flows From Investing Activities:
Purchase of Investments Available-for-Sale	(13,765)	(16,514)
Sale of Investments Available-for-Sale	15,181	17,497
Purchase of Equipment	(281)	(283)
Cash Provided By Investing Activities	1,135	700
Cash Flows From Financing Activities:
Proceeds from Term Loan	0	22,500
Debt Issuance Costs	0	(1,343)
Payments on Short Term Note Payable	0	(763)
Repurchase of Common Stock to Pay Employee Withholding Taxes	(6)	(19)
Cash (Used In) Provided By Financing Activities	(6)	30,357
(Decrease) Increase in Cash and Cash Equivalents	(16,304)	14,903
Cash and Cash Equivalents at Beginning of Period	48,682	11,794
Cash and Cash Equivalents at End of Period	32,378	26,697
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	982	410
Supplemental Disclosure of Noncash Investing and Financing Activities:
Change in Unrealized Loss on Marketable Securities Available-for-Sale	(7)	(12)
Fair Value of Warrants issued related to Debt Financing	0	501
Public Offering
Cash Flows From Financing Activities:
Proceeds from the Issuance of Common Stock	0	8,148
Offering Costs from the Issuance of Common Stock	0	(144)
At-the-Market Offering
Cash Flows From Financing Activities:
Proceeds from the Issuance of Common Stock	0	2,034
Offering Costs from the Issuance of Common Stock	$ 0	$ (56)