Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Net loss	$ (15,380)	$ (13,421)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	340	2,074
Common stock issued to vendor	0	26
Subsidiary stock issues to vendor	72	36
Warrant issued to vendor	0	9
Change in fair value of warrant liabilities	0	(4,083)
Depreciation	240	272
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(788)	234
Right of use asset	118	0
Accounts payable	1,282	(987)
Accrued expenses	857	(607)
Accrued employee benefits	(397)	(742)
Lease liability	(217)	0
Deferred rent	0	(90)
Net Cash Used In Operating Activities	(13,873)	(17,279)
Cash Flows From Investing Activities:
Purchases of property and equipment	0	(7)
Net Cash Used In Investing Activities	0	(7)
Cash Flows From Financing Activities:
Proceeds from Units offering, net of issuance cost	0	16,916
Proceeds from "at the market" stock issuance	0	12,172
Net Cash Provided By Financing Activities	0	29,088
Net increase (decrease) increase in cash	(13,873)	11,802
Cash and cash equivalents at beginning of year	28,918	17,116
Cash and cash equivalents at end of year	15,045	28,918
NONCASH FINANCING ACTIVITIES:
Conversion of Series B Preferred Stock	999	4,042
Right of use asset from operating lease	537	0
In-kind dividends in preferred stock	248	243
Series B Preferred Stock [Member]
NONCASH FINANCING ACTIVITIES:
Deemed dividends for accretion	$ 525	$ 11,681