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Summary of Operating Loss Carryforwards (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | $ 17,449 |
Foreign Operating Loss Carryforwards |  | $ 3,991
2021 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 333 |
2022 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 2,203 |
2023 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 3,368 |
2024 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 812 |
2025 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 191 |
2026-2030 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 7,452 |
2031-2035 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 2,147 |
Foreign Operating Loss Carryforwards |  | 68
Beyond 2035 |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | 73 |
Non-Expiring |  |
Operating Loss Carryforwards [Line Items] |  |
U.S. Federal Operating Loss Carryforwards | $ 870 |
Foreign Operating Loss Carryforwards |  | $ 3,923

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