Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 5,550	$ 3,125
Prepaid expenses and other assets	68	151
Total current assets	5,618	3,276
Property and equipment, net	4
Patent portfolios	57,481	64,835
Goodwill	1,712	1,712
Deposit	26	30
Total assets	64,841	69,853
Current liabilities
Accounts payable and accrued expenses	145	270
Accrued salaries and benefits	39	233
Accrued patent cost		1,000
Warrant liability	1	48
Total liabilities	185	1,551
Series I redeemable preferred stock, $0.0001 par value; 35,541 shares issued and outstanding at September 30, 2014 and 119,760 shares issued and outstanding at December 31, 2013; liquidation preference of $167 per share	5,935	20,000
Stockholders' equity
Common stock, $0.0001 par value, 200,000,000 shares authorized; 28,599,695 shares and 3,770,113 shares issued at September 30, 2014 and December 31, 2013, respectively; 28,599,467 and 3,769,712 shares outstanding at September 30, 2014 and December 31, 2013, respectively	3
Additional paid-in-capital	136,933	102,043
Treasury stock, at cost, 228 shares at September 30, 2014 and 401 shares at December 31, 2013	(264)	(465)
Accumulated deficit	(77,951)	(53,276)
Total stockholders' equity	58,721	48,302
Total liabilities and stockholders' equity	64,841	69,853
Series B Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series C Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series D Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series D-1 Preferred [Member]
Stockholders' equity
Preferred stock
Series E Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series F Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series F-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series H Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock