Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 157	$ 805
Marketable securities	775	3,500
Prepaid expenses and other assets	20	107
Total current assets	952	4,412
Property and equipment, net	3	4
Patent portfolios, net	$ 13,910	55,004
Goodwill		1,712
Deposit	$ 26	26
Total assets	14,891	61,158
Current liabilities
Accounts payable and accrued expenses	441	728
Accrued salaries and benefits	215	$ 329
Warrant liabilities	1,759
Short-term lease liabilities	177	$ 173
Total current liabilities	2,592	1,230
Long-term lease liabilities	274	407
Total liabilities	2,866	1,637
Series I redeemable preferred stock, $0.0001 par value; 29,940 and 35,541 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively; liquidation preference of $167 per share	$ 5,000	$ 5,935
Commitments and contingencies
Stockholders' equity
Common stock, $0.0001 par value, 200,000,000 shares authorized; 34,402,991 and 28,609,695 shares issued at September 30, 2015 and December 31, 2014, respectively; 34,402,763 and 28,609,467 shares outstanding at September 30, 2015 and December 31, 2014, respectively	$ 3	$ 3
Additional paid-in-capital	138,214	137,655
Treasury stock, at cost, 228 shares at September 30, 2015 and December 31, 2014, respectively	(264)	(264)
Accumulated deficit	(130,928)	(83,808)
Total stockholders' equity	7,025	53,586
Total liabilities and stockholders' equity	$ 14,891	$ 61,158
Series A 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 F-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series H Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series J Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.