Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 8,157,000	$ 5,132,000
Prepaid expenses and other current assets	251,000	253,000
Total current assets	8,408,000	5,385,000
Property and equipment, net	503,000	816,000
In-process research and development	2,731,000	4,661,000
Acquired patents, net	245,000	276,000
Total assets	11,887,000	11,138,000
Current liabilities
Accounts payable and accrued liabilities	2,572,000	1,968,000
Total current liabilities	2,572,000	1,968,000
Derivative liabilities	22,000	292,000
Deferred tax liability	819,000	1,147,000
Total liabilities	3,413,000	3,407,000
Stockholders' equity
Common stock, $0.01 par value; 217,000,000 authorized and 32,294,008 shares issued and outstanding at December 31, 2018; 67,000,000 authorized and 9,498,928 shares issued and outstanding at December 31, 2017	323,000	95,000
Additional paid-in capital	414,467,000	401,842,000
Accumulated deficit	(406,316,000)	(394,206,000)
Total stockholders' equity	8,474,000	7,731,000
Total liabilities and stockholders' equity	$ 11,887,000	$ 11,138,000

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.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.