Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities:
Net loss	$ (10,116)	$ (15,380)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	350	340
Subsidiary stock issuances to vendor	178	72
Depreciation	201	240
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(326)	(788)
Right of use asset	141	118
Accounts payable	(1,429)	1,282
Accrued expenses	(851)	857
Accrued employee benefits	(67)	(397)
Lease liability	(249)	(217)
Net Cash Used In Operating Activities	(12,168)	(13,873)
Cash Flows From Investing Activities:
Purchases of property and equipment	(9)	0
Net Cash Used In Investing Activities	(9)	0
Cash Flows From Financing Activities:
Proceeds from "at-the-market" stock issuance	3,359	0
Net Cash Provided By Financing Activities	3,359	0
Net decrease in cash	(8,818)	(13,873)
Cash and cash equivalents at beginning of year	15,045	28,918
Cash and cash equivalents at end of year	6,227	15,045
NONCASH FINANCING ACTIVITIES:
Conversion of Series B Preferred Stock	2,284	999
Effect of Warrant exercise price adjustment	880	0
In-kind dividends paid in preferred stock	254	248
Right of use assets from operating lease	0	537
Series B Preferred Stock [Member]
NONCASH FINANCING ACTIVITIES:
Deemed dividends for accretion of Series B Preferred Stock discount	$ 1,380	$ 525