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Equity Incentive Plan - Summary of Company's Outstanding Restricted Stock (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 72,071
Expected future remaining compensation expense | $ | $ 992 | $ 992
Expected future compensation expense, restricted shares remaining vesting period |  | 2 years 6 months 18 days
Restricted Shares Awarded on March 20, 2017 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 1,198
Date of Award |  | Mar. 20, 2017
Expected future remaining compensation expense | $ | 6 | $ 6
Expected future compensation expense, restricted shares remaining vesting period |  | 3 months
Restricted Shares Awarded on April 10, 2018 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 3,114
Date of Award |  | Apr. 10, 2018
Expected future remaining compensation expense | $ | 41 | $ 41
Expected future compensation expense, restricted shares remaining vesting period |  | 1 year 3 months
Restricted Shares Awarded on March 14, 2019 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 3,401
Date of Award |  | Mar. 14, 2019
Expected future remaining compensation expense | $ | 16 | $ 16
Expected future compensation expense, restricted shares remaining vesting period |  | 3 months
Restricted Shares Awarded on March 14, 2019 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 6,560
Date of Award |  | Mar. 14, 2019
Expected future remaining compensation expense | $ | 89 | $ 89
Expected future compensation expense, restricted shares remaining vesting period |  | 2 years 3 months
Restricted Shares Awarded on March 14, 2020 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 9,139
Date of Award |  | Mar. 14, 2020
Expected future remaining compensation expense | $ | 114 | $ 114
Expected future compensation expense, restricted shares remaining vesting period |  | 1 year 3 months
Restricted Shares Awarded on March 14, 2019 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 10,390
Date of Award |  | Mar. 14, 2020
Expected future remaining compensation expense | $ | 160 | $ 160
Expected future compensation expense, restricted shares remaining vesting period |  | 3 years 3 months
Restricted Shares Awarded on March 3, 2021 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 16,277
Date of Award |  | Mar. 03, 2021
Expected future remaining compensation expense | $ | 243 | $ 243
Expected future compensation expense, restricted shares remaining vesting period |  | 4 years 3 months
Restricted Shares Awarded on March 3, 2021 [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Granted |  | 21,992
Date of Award |  | Mar. 03, 2021
Expected future remaining compensation expense | $ | $ 323 | $ 323
Expected future compensation expense, restricted shares remaining vesting period |  | 2 years 3 months
Restricted Stock [Member] |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |
Number of Restricted Shares, Nonvested at beginning of period | 72,071 | 54,274
Number of Restricted Shares, Granted | 0 | 39,139
Number of Restricted Shares, Vested | 0 | (20,275)
Number of Restricted Shares, Forfeited | 0 | (1,067)
Number of Restricted Shares, Nonvested at end of period | 72,071 | 72,071
Weighted Average Grant Date Fair Value, Nonvested at beginning of period | $ / shares | $ 20.13 | $ 20.90
Weighted Average Grant Date Fair Value, Granted | $ / shares | 0 | 19.17
Weighted Average Grant Date Fair Value, Vested | $ / shares | 0 | 20.35
Weighted Average Grant Date Fair Value, Forfeited | $ / shares | 0 | 19.56
Weighted Average Grant Date Fair Value, Nonvested at end of period | $ / shares | $ 20.13 | $ 20.13

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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