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