Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net loss	$ (7,963)	$ (3,697)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	2,428
Fair value adjustments for warrant liabilities	(40)	2,786
Depreciation		16
Non-cash registration rights penalty	700
Stock-based compensation	3,396	4
Changes in assets and liabilities:
Other receivables		(1)
Prepaid expenses and other assets	44	14
Accounts payable and accrued expenses	69	(262)
Accrued salaries and benefits	(156)
Net cash used in activities of continuing operations	(1,522)	(1,140)
Net cash provided by (used in) activities of discontinued operations		89
Net cash used in operating activities	(1,522)	(1,051)
Cash flow from investing activities
Payment of accrued patent costs	(1,000)
Net cash used in investing activities	(1,000)
Cash flow from financing activities
Proceeds from issuance of common stock and warrants, net	3,900
Net cash provided by financing activities	3,900
Net decrease in cash and cash equivalents	1,378	(1,051)
Cash and cash equivalents, beginning of year	3,125	4,498
Cash and cash equivalents, end of year	4,503	3,447
Cash paid for interest and taxes
Non-cash investing and financing activities
Retirement of treasury stock	201
Conversion of Series D-1 preferred stock to common stock	1
Issuance of Series C Convertible Preferred Stock in connection with exchange of warrants		$ 5,696