Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 142,000	$ 805,000
Marketable securities	3,392,000	3,500,000
Prepaid expenses and other assets	330,000	107,000
Total current assets	3,864,000	4,412,000
Property and equipment, net	5,000	4,000
Patent portfolios, net	$ 9,799,000	55,004,000
Goodwill		1,712,000
Deposit	$ 26,000	26,000
Total assets	13,694,000	61,158,000
Current liabilities
Accounts payable and accrued expenses	384,000	728,000
Accrued salaries and benefits	645,000	$ 329,000
Warrant liabilities	2,959,000
Short-term deferred revenue	290,000
Short-term lease liabilities	178,000	$ 173,000
Total current liabilities	4,456,000	$ 1,230,000
Long-term deferred revenue	259,000
Long-term lease liabilities	229,000	$ 407,000
Total liabilities	$ 4,944,000	1,637,000
Series I redeemable convertible preferred stock, $0.0001 par value; 0 and 35,541 shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively; liquidation preference of $167 per share		$ 5,935,000
Commitments and contingencies
Stockholders' equity
Common stock, $0.0001 par value, 100,000,000 shares authorized; 2,539,859 and 1,505,773 shares issued at December 31, 2015 and December 31, 2014, respectively; 2,539,847 and 1,505,761 shares outstanding at December 31, 2015 and December 31, 2014, respectively
Additional paid-in-capital	$ 144,287,000	$ 137,658,000
Treasury stock, at cost, 12 shares at December 31, 2015 and December 31, 2014, respectively	(264,000)	(264,000)
Accumulated deficit	(135,273,000)	(83,808,000)
Total stockholders' equity	8,750,000	53,586,000
Total liabilities and stockholders' equity	$ 13,694,000	$ 61,158,000
Series D 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
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series F-1 Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series C Convertible Preferred Stock [Member]
Stockholders' equity
Preferred stock
Series D-1 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.