Income tax examination tax refund on interest income.

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Income taxes.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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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 a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible 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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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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Expiration date of the tax credit carryforward, in CCYY-MM-DD format.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Operating loss carryforwards	$ 4,879	$ 6,914
Valuation allowances	4,713	3,128
Incentive tax credit carryforwards	6,669	5,062
Unrecognized tax benefits	4,069	3,894	$ 3,827
Potential increase (decrease) in income tax provision	3,400	3,300
Income tax, tax refund amount	1
CaseStack, Inc. [Member] \| Internal Revenue Service [Member]
Income Taxes [Line Items]
Operating loss carryforwards	1,300
Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards	2,800
Incentive tax credit carryforwards	88
Federal [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards		$ 4,100
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	2,100
Incentive tax credit carryforwards	6,600
State [Member] \| Loss Carryforward [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Valuation allowances	69
State [Member] \| Tax Incentive Credit Carryforwards [Member]
Income Taxes [Line Items]
Valuation allowances	4,600
Minimum [Member]
Income Taxes [Line Items]
Possible reduction in unrecognized tax benefits resulting from audit settlements	$ 1,000
Minimum [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2020
Minimum [Member] \| Federal [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration date	Dec. 31, 2025
Minimum [Member] \| State [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration date	Dec. 31, 2020
Maximum [Member]
Income Taxes [Line Items]
Possible increase in unrecognized tax benefits resulting from audit settlements	$ 1,000
Maximum [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2038
Maximum [Member] \| Federal [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration date	Dec. 31, 2028
Maximum [Member] \| State [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration date	Dec. 31, 2024