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Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) segment | Dec. 31, 2021 USD ($) | 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 | $ 123 | $ 64 |
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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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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