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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | $ 2,845 | $ 4,879 |
Valuation allowances | 6,518 | 4,713 |
Incentive tax credit carryforwards | 8,715 | 6,669 |
Unrecognized tax benefits | 4,292 | 4,069 | $ 3,894
Potential increase (decrease) in income tax provision | 3,700 | 3,400 |
CaseStack, Inc. [Member] | Internal Revenue Service [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | 1,300 | $ 1,300 |
Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | 1,500 |  |
Incentive tax credit carryforwards | 100 |  |
Federal [Member] | CaseStack, Inc. [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards |  |  | $ 4,100
State [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | 1,200 |  |
Incentive tax credit carryforwards | 8,600 |  |
State [Member] | Loss Carryforward [Member] | CaseStack, Inc. [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | 55 |  |
State [Member] | Tax Incentive Credit Carryforwards [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | 6,400 |  |
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, 2021 |  |
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, 2021 |  |
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, 2039 |  |
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, 2025 |  |

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