Consolidated Balance Sheets - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 5,535,000	$ 8,157,000
Prepaid expenses and other current assets	407,000	251,000
Total current assets	5,942,000	8,408,000
Property and equipment, net	420,000	503,000
In-process research and development	2,731,000	2,731,000
Acquired patents, net	238,000	245,000
Right-of-use asset	286,000
Total assets	9,617,000	11,887,000
Current liabilities
Accounts payable and accrued liabilities	1,757,000	1,220,000
Accrued compensation	1,834,000	1,352,000
Total current liabilities	3,591,000	2,572,000
Derivative liabilities	33,000	22,000
Deferred tax liability	819,000	819,000
Other long-term liabilities	213,000
Total liabilities	4,656,000	3,413,000
Stockholders' equity
Common stock, $0.01 par value; 67,000,000 shares authorized at September 30, 2018 and December 31, 2017; 16,468,308 and 9,498,928 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	328,000	323,000
Additional paid-in capital	414,566,000	414,467,000
Accumulated deficit	(409,933,000)	(406,316,000)
Total stockholders' equity	4,961,000	8,474,000
Total liabilities and stockholders' equity	$ 9,617,000	$ 11,887,000

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.