Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Components of Net Deferred Tax Assets

The components of the net deferred tax assets are as follows at December 31:

	2016			2015
	(in thousands)
Operating loss carryforwards	$	44,219		$	37,152
Tax credit carryforwards		1,195			1,195
Other temporary differences		5,707			5,048
		51,121			43,395
Less valuation allowance		(51,121	)		(43,395	)
Net deferred tax asset	$	—		$	—

Primary Factors Affecting Income Tax Rates

The primary factors affecting the Company’s income tax rates were as follows:

	2015		2014
Tax benefit at U.S. statutory rates		(34%)		(34%)
State tax benefit		(3.7%)		(5.3%)
Permanent differences		2.3%		5.4%
Expiring state NOL’s		1.6%		1.4%
Changes in valuation allowance		33.8%		32.5%
		0%		0%