Unaudited Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net loss	$ (9,412)	$ (7,364)
Adjustments to reconcile net loss to net cash used for operating activities:
Share-based compensation expense	4,852	5,825
Depreciation expense	5	1
Changes in operating assets and liabilities:
Restricted cash	0	(37)
Prepaid expenses and other current assets	(105)	(42)
Accounts payable and accrued expenses	(46)	68
Accrued payroll and related expenses	21	24
Net cash used for operating activities	(4,685)	(1,525)
Investing activities:
Purchase of equipment and furnishings	(56)	(38)
Net cash used for investing activities	(56)	(38)
Net decrease in cash and cash equivalents:	(4,741)	(1,563)
Cash and cash equivalents at beginning of period	8,629	3,405
Cash, cash equivalents at end of period	3,888	1,842
Non-cash investing and financing activity
Dividends paid in shares of Series C-12 and C-22 Preferred Stock	0	463
Conversion of Series C-1 Preferred Stock into Common Stock [Member]
Non-cash investing and financing activity
Conversion of preferred stock into common stock	3,099	11
Conversion of Series D-1 Preferred Stock into Common Stock [Member]
Non-cash investing and financing activity
Conversion of preferred stock into common stock	0	47
Conversion of Series F Preferred Stock into Common Stock [Member]
Non-cash investing and financing activity
Conversion of preferred stock into common stock	$ 452	$ 0