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Components of the Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accruals and reserves	$ 936	$ 751
Net operating loss carry forwards	34,392	23,559
Tax credit carry forwards	9,945	3,772
Fixed and intangible assets	10	3
Valuation allowance	$ (45,283)	$ (28,085)

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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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