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Commitments and Contingencies - Schedule of Future Payments Under Noncancelable Operating Leases (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Commitments And Contingencies Disclosure [Abstract] |  |
2020 | $ 188 |
2021 | 146 |
Total minimum lease payments | 334 |
Less imputed interest | (10) |
Present value of lease liabilities | 324 |
Less current portion | (180) |
Non-current operating lease liability | $ 144 |
2019 |  | $ 180
2020 |  | 188
2021 |  | 146
Total minimum lease payments |  | $ 514

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