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Commitments and Contingencies - Schedule of Right-of-use Assets Obtained in Exchange for Lease Obligations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract] |  |
Operating leases | $ 56 | $ 369
Finance leases | $ 180 |

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