Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (47,538)	$ (19,531)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	$ 4,871	4,878
Non-cash registration rights penalty		654
Fair value adjustment for warrant liabilities		(47)
Stock-based compensation	$ 134	$ 10,388
Depreciation expenses	1
Unrealized gain on marketable securities	45
Impairment of intangible assets	40,357
Changes in assets and liabilities:
Prepaid expenses and other assets	34	$ 64
Accounts payable and accrued expenses	(217)	501
Accrued salaries and benefits	(64)	$ (192)
Accrued lease liabilities	(86)
Net cash used in operating activities	(2,463)	$ (3,285)
Cash flows from investing activities
Purchase of marketable securities	(3,774)
Sale of marketable securities	$ 6,454
Payment of accrued patent costs		$ (1,000)
Net provided by (cash used) in investing activities	$ 2,680	(1,000)
Cash flows from financing activities
Proceeds from issuance of common stock and warrants, net		3,874
Proceeds from issuance of preferred stock, net		18,497
Redemption of Series I redeemable convertible preferred stock	$ (935)	(14,065)
Net cash (used in) provided by financing activities	(935)	8,306
Net (decrease) increase in cash and cash equivalents	(718)	4,021
Cash and cash equivalents, beginning of period	805	3,125
Cash and cash equivalents, end of period	$ 87	$ 7,146
Cash paid for interest and taxes
Non-cash investing and financing activities
Retirement of treasury stock		$ 201
Conversion of preferred stock to common stock		$ 1