CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Cash Flows [Abstract]
Net loss from continuing operations	$ (9,384)	$ (4,824)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	51	65
Non-cash accretion of debt issuance costs	1,078	712
Issuance of common stock as repayment of interest on long-term debt	463	0
Non-cash stock-based compensation	425	1,278
Fair value of common stock issued in exchange for services	82	0
Change in fair value of common stock warrants	(3,707)	(10,520)
Change in fair value of contingent consideration	132	(5,327)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	147	141
Litigation settlement insurance recovery	0	21,700
Litigation settlement payable	350	(19,900)
Accounts payable	(455)	(324)
Accrued expenses and other current liabilities	(1,658)	(589)
Net cash used in continuing operating activities	(12,476)	(17,588)
Loss from discontinued operations	(10,738)	(6,280)
Impairment charge from classification of assets held for sale	0	0
Changes in operating assets and liabilities attributable to discontinued operations	3,250	(839)
Net cash used in discontinued operating activities	(7,488)	(7,119)
Net cash used in operating activities	(19,964)	(24,707)
Cash flows from investing activities:
Increase (Decrease) in Restricted Cash	(25)
Cash paid for purchase of equipment and furnishings		(6)
Net cash used in continuing investing activities	(25)	(6)
Selling costs paid for sale of commercial assets		(1,050)
Net cash used in discontinued investing activities	0	(1,050)
Net cash used in investing activities	(25)	(1,056)
Cash flows from financing activities:
Net proceeds from issuance of common stock	15,524	20,189
Net proceeds from exercise of stock options		261
Proceeds from exercise of warrants	0	233
Proceeds from common stock issued in connection with Employee Stock Purchase Plan	5	78
Change in restricted cash related to debt principal paid in common stock	0	23,641
Change in restricted cash related to debt principal paid in common stock	4,450	0
Minimum cash covenant on long-term debt	0	(24,000)
Principal payments on long-term debt	0	(4,779)
Net cash provided by financing activities	19,979	15,623
Net increase in cash and cash equivalents	(10)	(10,140)
Cash and cash equivalents at the beginning of period	18,083	29,730
Cash and cash equivalents at end of period	18,073	19,590
Supplemental disclosure of cash flow information:
Cash received during the periods for interest	83	49
Cash paid during the periods for interest	102	606
Supplemental disclosure of non-cash investing and financing activities:
Fair value of warrants issued in connection with common stock recorded as issuance cost	10,357	5,590
Issuance of common stock as repayment of interest on long-term debt through issuance of common stock	$ 4,814	0
Reclassification of warrant liabilities upon exercise		$ (324)