Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (7,030)	$ (3,804)
Loss from discontinued operations		(514)
Loss from continuing operations	(7,030)	(3,290)
Adjustments to reconcile net loss from continuing operations to net cash used in operating activities:
Depreciation and amortization	489	492
Stock-based compensation expense	202	341
Board fees paid with common stock	46	82
Change in fair value of stock warrants	1,919	(163)
Change in fair value of contingent consideration	206	428
Operating loss on minority interest investment	190
Change in operating assets and liabilities:
Prepaid expenses and other current assets	(74)	(80)
Due from related party	(8)
Accounts payable	324	409
Accrued compensation and other current liabilities	49	(252)
Net cash used in continuing operating activities	(3,687)	(2,033)
Net cash used in discontinued operating activities		(487)
Net cash used in operating activities	(3,687)	(2,520)
Cash flows from investing activities:
Purchases of property and equipment	(10)
Net cash used in continuing investing activities	(10)
Net cash used in investing activities	(10)
Cash flows from financing activities:
Cash paid for the issuance of common stock and common stock warrants		(112)
Net cash used in continuing financing activities		(112)
Net cash provided by discontinued financing activities		400
Net cash provided by financing activities		288
Net decrease in cash, cash equivalents and restricted cash	(3,697)	(2,232)
Net increase in cash and cash equivalents included in current assets held for sale		(2)
Cash, cash equivalents and restricted cash, beginning of period	23,099	17,135
Cash, cash equivalents and restricted cash, end of period	19,402	14,901
Supplemental disclosures of non-cash investing and financing information
Accrued liability for cost of issuing common stock		91
Continuing Operations [Member]
Cash flows from financing activities:
Net decrease in cash, cash equivalents and restricted cash from continuing operations	$ (3,697)	(2,145)
Discontinued Operations
Cash flows from financing activities:
Net decrease in cash, cash equivalents and restricted cash from continuing operations		$ (87)