Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net Loss	$ (13,421)	$ (15,492)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	2,074	3,409
Common stock issued to vendor	26	0
Subsidiary stock issues to vendor	36	0
Warrant issued to vendor	9	0
Change in fair value of warrant liabilities	(4,083)	(10,738)
Depreciation	272	245
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	234	1,688
Deposits and other assets	0	0
Accounts payable	(987)	27
Accrued expenses	(607)	(1,101)
Accrued employee benefits	(742)	1,761
Deferred rent	(90)	(3)
Net Cash Used In Operating Activities	(17,279)	(20,204)
Cash Flows From Investing Activities:
Purchases of property and equipment	(7)	(212)
Net Cash Used In Investing Activities	(7)	(212)
Cash Flows From Financing Activities:
Proceeds from sale of Series A Preferred Stock, net of issuance cost	0	11,953
Proceeds from Units offering, net of issuance cost	16,916	0
Proceeds from "at the market" stock issuance	12,172	6,358
Proceeds from issuance of common stock for stock option exercises	0	166
Net Cash Provided By Financing Activities	29,088	18,477
Net increase (decrease) in cash	11,802	(1,939)
Cash and cash equivalents at beginning of period	17,116	19,055
Cash and cash equivalents at end of period	28,918	17,116
NONCASH FINANCING ACTIVITIES:
Conversion of Series B Preferred Stock	4,042	0
In-kind dividends in preferred stock	243	73
Series A Preferred Stock [Member]
NONCASH FINANCING ACTIVITIES:
Deemed dividend for accretion of Preferred Stock discount	0	6,889
Series B Preferred Stock [Member]
NONCASH FINANCING ACTIVITIES:
Deemed dividend for accretion of Preferred Stock discount	$ 11,681	$ 0