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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 |  |

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