Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities:
Net Loss	$ (7,086)	$ (6,540)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	155	1,233
Subsidiary stock issued to consultant	62	0
Warrant issued to consultant	0	9
Change in fair value of warrant liabilities	0	(3,438)
Depreciation and amortization	122	141
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(706)	292
Right of use asset	56	0
Accounts payable	490	(803)
Accrued expenses	627	(526)
Accrued employee benefits	(821)	(711)
Lease Liability	(105)	0
Deferred rent	0	(44)
Net Cash Used In Operating Activities	(7,206)	(10,387)
Net Cash Used In Investing Activities	0	0
Cash Flows From Financing Activities:
Proceeds from issuance ATM offering, net of issuance costs	0	400
Net Cash Provided By Financing Activities	0	400
Net decrease in cash	(7,206)	(9,987)
Cash and cash equivalents at beginning of period	28,918	17,116
Cash and cash equivalents at end of period	21,712	7,129
Noncash Financing Activities:
Right of use asset from operating lease	538	0
Deemed dividends for beneficial conversion feature	515	0
In-kind dividends paid in preferred stock	122	120
Series B Preferred Stock [Member]
Noncash Financing Activities:
Conversion of Series B Preferred Stock	$ 825	$ 0