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Components of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accruals and reserves	$ 751	$ 1,112
Net operating loss carry forwards	23,559	11,519
R&D tax credit carry forwards	3,772	3,545
Fixed and intangible assets	3	89
Valuation Allowance	$ (28,085)	$ (16,265)

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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 before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.

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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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