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Components of the Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accruals and reserves	$ 1,095	$ 936
Net operating loss carry forwards	29,505	34,392
Tax credit carry forwards	7,789	9,945
Fixed and intangible assets	7	10
Valuation allowance	$ (38,396)	$ (45,283)

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Deferred tax assets fixed assets and intangibles.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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