Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net loss	$ (30,532)	$ (17,965)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of patent portfolio	9,831	267
Non-cash registration rights penalty	654
Fair value adjustments for warrant liabilities	(48)	2,618
Depreciation		24
Stock-based compensation	12,676	9,971
Issuance of common stock for contractual dispute settlement	225
Unrealized loss on marketable securities	54
Changes in assets and liabilities:
Marketable securities	(3,554)
Other receivables		2
Prepaid expenses and other assets	44	(14)
Accounts payable and accrued expenses	458	(158)
Accrued salaries and benefits	96	(52)
Accrued lease liabilities	580
Deferred rent		(45)
Net cash used in activities of continuing operations	(9,516)	(5,352)
Net cash provided by (used in) activities of discontinued operations		86
Net cash used in operating activities	(9,516)	(5,266)
Cash flow from investing activities
Cash acquired in acquisition of North South		2,662
Security deposits collected		(4)
Security deposits refund	4
Purchase of patent portfolio		(2,000)
Purchase of property and equipment	(4)
Payment of accrued patent costs	(1,000)
Net cash used in investing activities	(1,000)	658
Cash flow from financing activities
Proceeds from issuance of common stock and warrants, net	3,874	310
Proceeds from issuance of note payable		500
Proceeds from issuance of preferred stock, net	18,387	2,425
Redemption of redeemable Series I preferred stock	(14,065)
Net cash provided by financing activities	8,196	3,235
Net decrease in cash and cash equivalents	(2,320)	(1,373)
Cash and cash equivalents, beginning of year	3,125	4,498
Cash and cash equivalents, end of year	805	3,125
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
Issuance of Series C Convertible Preferred Stock in connection with exchange of warrants		5,696
Issuance of common and preferred stock for Rockstar patents		61,000
Accrued Rockstar patent cost		1,000
Retirement of Series E Convertible Preferred STock		$ 500