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Income taxes.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
U.S. federal corporate tax rate	21.00%	34.90%	35.00%
Tax cuts and jobs act of 2017, accounting complete [true false]	true
Adjustment of income tax expense	$ 500,000
Change in net deferred provisional tax expense (benefit)		$ (75,200,000)
Effective tax rate of foreign earnings in the form of cash and cash equivalents	15.50%
Effective tax rate of remaining earnings	8.00%
Income tax expense in accordance with tax ACT of 2017	$ 30,000
Operating loss carryforwards	6,914,000	1,388,000
Valuation allowances	3,128,000	1,681,000
Incentive tax credit carryforwards	5,062,000	3,411,000
Unrecognized tax benefits	3,894,000	3,827,000	$ 1,832,000
Potential increase (decrease) in income tax provision	3,300,000	$ 2,800,000
Income tax interest income on tax refund regognized	100,000
Income tax penalties expense	1,000
CaseStack, Inc. [Member]
Income Taxes [Line Items]
Valuation allowances	49,000
CaseStack, Inc. [Member] \| Internal Revenue Service [Member]
Income Taxes [Line Items]
Operating loss carryforwards	100,000
Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards	4,000.0
Incentive tax credit carryforwards	45,000
Federal [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards	4,100,000
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	2,900,000
Incentive tax credit carryforwards	5,000,000.0
State [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards	1,000,000.0
State [Member] \| Loss Carryforward [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Valuation allowances	49,000
State [Member] \| Tax Incentive Credit Carryforwards [Member]
Income Taxes [Line Items]
Valuation allowances	3,100,000
Maximum [Member]
Income Taxes [Line Items]
U.S. federal corporate tax rate		35.00%
Possible increase in unrecognized tax benefits resulting from audit settlements	$ 1,000,000.0
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, 2027
Maximum [Member] \| State [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration date	Dec. 31, 2023
Minimum [Member]
Income Taxes [Line Items]
Possible reduction in unrecognized tax benefits resulting from audit settlements	$ 1,000,000.0
Minimum [Member] \| CaseStack, Inc. [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2019
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, 2019