Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Components of Net Deferred Tax Assets

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

	2019			2018
	(in thousands)
Operating loss carryforwards	$	39,982		$	36,417
Tax credit carryforwards		910			1,195
Other temporary differences		5,278			4,678
		46,170			42,290
Less valuation allowance		(46,170	)		(42,290	)
Net deferred tax asset	$	—		$	—

Primary Factors Affecting Income Tax Rates

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

	2019			2018
Tax benefit at U.S. statutory rates		(21	%)		(21	%)
State tax benefit		(4.7	%)		(4.7	%)
Permanent differences		0.8	%		4.0	%
Impact of the 2017 Tax Act		—			—
Other		(4.2	%)		1.1	%
Expiring state NOL’s		—			—
Changes in valuation allowance		29.1	%		20.6	%
		0	%		0	%