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Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |
Maturity period of liquid investments | 3 months |  |
Number of operating segments | segment | 1 |  |
Right-of-use assets | $ 64 | $ 146 |
ASU 2016-02 [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2019 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
Right-of-use assets |  |  | $ 500
Operating lease liability |  |  | $ 500
ASU 2018-13 [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
ASU 2020-06 [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
Restricted Stock Unit Awards [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Award vesting period | 4 years |  |

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