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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components of Income/(Loss) Before Income Tax Provision (Benefit)

The components of income/(loss) before income tax provision (benefit) as of December 31, 2018 and 2017 are as follows (in thousands):

		2018			2017
U.S.	$	(12,240)		$	(21,915)
Foreign		(394)			(771)
	$	(12,634)		$	(22,686)

Reconciliation of Total Income Tax Provision

A reconciliation of the total income tax provision tax rate to the statutory federal income tax rates of 21% and 34% for the years ended December 31, 2018 and 2017, respectively, is as follows:

		2018				2017
Income tax expense (benefit) at federal statutory rate			(21.0	)%			(34.0	)%
Income tax expense (benefit) at state statutory rate			(5.8	)%			(3.9	)%
Change in valuation allowance			31.8	%			(172.4	)%
Change in state rate			(0.1	)%			(0.8	)%
Permanent interest adjustments			0.5	%			0.2	%
Stock compensation			1.3	%			3.0	%
Research credit			(1.0	)%			(1.1	)%
Foreign rate differential			—				202.1	%
NOLs expiring and adjustments to NOL			—				7.0	%
Mark to market adjustment			(3.7	)%			—
Other, net			(2.0	)%			(0.1	)%
			0.0	%			0.0	%

Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of our deferred tax assets and deferred tax liabilities as of December 31, 2018 and 2017 are as follows (in thousands):

		2018				2017
Deferred tax assets:
Allowances and reserves		$	270			$	140
Accrued expenses			122				154
Stock based compensation			996				1,065
Net operating loss carryforwards			91,197				87,426
Income tax credit carryforwards			8,671				8,587
Property and equipment, principally due to differences in    depreciation			548				514
Other, net			38				45
			101,842				97,931
Valuation allowance			(101,091	)			(97,089	)
Total deferred tax assets, net of allowance			751				842
Deferred tax liabilities:
Intangibles assets			(751	)			(842	)
Total deferred tax liability			(751	)			(842	)
Net deferred tax assets (liability)		$	—			$	—

Unrecognized Tax Benefits Activity

Following is a tabular reconciliation of the unrecognized tax benefits activity during the years ended December 31, 2018 and 2017 (in thousands):

		2018				2017
Unrecognized Tax Benefits – Beginning		$	2,157			$	2,062
Gross increases – tax positions in prior period			1				—
Gross decreases – tax positions in prior period			(3	)			—
Gross increase – current-period tax positions			61				95
Unrecognized Tax Benefits – Ending		$	2,216			$	2,157

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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