Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 3,125	$ 4,498
Other receivables		2
Prepaid expenses and other assets	151	102
Assets of segment held for sale		104
Total current assets	3,276	4,706
Property and equipment, net of accumulated depreciation of $332 and $308		24
Patent portfolios, net of accumulated amortization of $267 and $0	64,835
Goodwill	1,712
Deposit	30	26
Total assets	69,853	4,756
Current liabilities
Accounts payable and accrued expenses	270	428
Accrued salaries and benefits	233	285
Accrued patent cost	1,000
Liabilities of segment held for sale		18
Total current liabilities	1,503	731
Deferred rent		45
Warrant liability	48	3,126
Total liabilities	1,551	3,902
Series I redeemable preferred stock, $0.0001 par value; 119,760 shares issued and outstanding; liquidation preference of $167 per share	20,000
Commitments and contingencies
Stockholders' equity
Common stock, $0.0001 par value, 50,000,000 shares authorized; 3,770,113 and 814,114 shares issued at December 31, 2013 and 2012, respectively; 3,769,712 and 813,713 shares outstanding at December 31, 2013 and 2012, respectively
Additional paid-in-capital	102,043	36,630
Treasury stock, at cost, 401 shares at December 31, 2013 and 2012, respectively	(465)	(465)
Accumulated deficit	(53,276)	(35,311)
Total stockholders' equity	48,302	854
Total liabilities and stockholders' equity	69,853	4,756
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series B Convertible 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 Convertible Preferred Stock [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