Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Taxes Tables

Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities

Deferred tax assets are summarized as follows (in thousands):

		December 31,
		2017		2016
Deferred tax assets
Reserves	$	1,561	$	2,351
Net operating loss carryforwards		82,210		126,335
R&D credit carryforwards		7,435		6,998
Depreciation/amortization deferred		13,005		20,024
Deferred revenue		1,081		2,091
Other		5,944		9,045
Net deferred taxes before valuation allowance		111,236		166,844
Less: Valuation allowance		(111,236)		(166,844)
Deferred tax assets	$	-	$	-