Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (19,531)	$ (4,504)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	4,878
Non-cash registration rights penalty	654
Fair value adjustments for warrant liabilities	(47)	2,647
Depreciation		22
Stock-based compensation	10,388	8
Changes in assets and liabilities:
Deferred rent		(1)
Other receivables		3
Prepaid expenses and other assets	64	27
Accounts payable and accrued expenses	501	(264)
Accrued salaries and benefits	(192)
Net cash used in activities of continuing operations	(3,285)	(2,062)
Net cash provided by (used in) activities of discontinued operations		84
Net cash used in operating activities	(3,285)	(1,978)
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	3,874
Proceeds from issuance of preferred stock, net	18,497	500
Redemption of redeemable Series I	(14,065)
Net cash provided by financing activities	8,306	500
Net decrease in cash and cash equivalents	4,021	(1,478)
Cash and cash equivalents, beginning of year	3,125	4,498
Cash and cash equivalents, end of year	7,146	3,020
Cash paid for interest and taxes
Non-cash investing and financing activities
Retirement of treasury stock	201
Conversion of preferred stock to common stock	3
Accrual of offering costs related to issuance of Series J Convertible Preferred Stock	110
Issuance of Series C Convertible Preferred Stock in connection with exchange of warrants		$ 5,696