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Income Taxes - Schedule of Reconciliation of Effective Income Tax Amount (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Income tax benefit using U.S. federal statutory rate | $ 1,352 | $ 1,397
State income tax expense | (35) | (30)
Foreign income tax expense | (210) | (78)
Foreign tax rate difference | (29) | 0
Non-deductible expenses | 26 | (66)
Impact of change in statutory rate |  |
Change in valuation allowance | (1,383) | (1,306)
Other | 23 | (33)
Provision for income taxes | $ (256) | $ (116)

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