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Equity Incentive Plan - Summary of Company's Restricted Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 11, 2017 | May 16, 2017 | May 17, 2016 | Jan. 04, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 43,906 |
Expected future remaining compensation expense |  |  |  |  | $ 317 |
Expected future compensation expense, restricted shares remaining vesting period |  |  |  |  | 2 years 9 months 14 days |
Restricted Shares Awarded on January 15, 2016 [Member] |  |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 10,260 |
Date of Award |  |  |  |  | Jan. 15, 2016 |
Expected future remaining compensation expense |  |  |  |  | $ 66 |
Expected future compensation expense, restricted shares remaining vesting period |  |  |  |  | 3 years |
Restricted Shares Awarded on March 11, 2016 [Member] |  |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 15,748 |
Date of Award |  |  |  |  | Mar. 11, 2016 |
Expected future remaining compensation expense |  |  |  |  | $ 33 |
Expected future compensation expense, restricted shares remaining vesting period |  |  |  |  | 1 year |
Restricted Shares Awarded on March 20, 2017 [Member] |  |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 11,713 |
Date of Award |  |  |  |  | Mar. 20, 2017 |
Expected future remaining compensation expense |  |  |  |  | $ 110 |
Expected future compensation expense, restricted shares remaining vesting period |  |  |  |  | 2 years |
Restricted Shares Awarded on March 20, 2017 [Member] |  |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 6,185 |
Date of Award |  |  |  |  | Mar. 20, 2017 |
Expected future remaining compensation expense |  |  |  |  | $ 108 |
Expected future compensation expense, restricted shares remaining vesting period |  |  |  |  | 4 years |
Restricted Stock [Member] |  |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |  |
Number of Restricted Shares, Nonvested at beginning of period |  |  |  |  | 37,050 | 16,983
Number of Restricted Shares, Granted | 367 | 6,804 | 12,285 | 2,730 | 17,898 | 28,864
Number of Restricted Shares, Vested |  |  |  |  | (12,810) | (5,657)
Number of Restricted Shares, Forfeited |  |  |  |  | 0 | (3,140)
Number of Restricted Shares, Nonvested at end of period |  |  |  |  | 42,138 | 37,050
Weighted Average Grant Date Fair Value, Nonvested at beginning of period |  |  |  |  | $ 10.77 | $ 10.82
Weighted Average Grant Date Fair Value, Granted |  |  |  |  | 22.15 | 10.75
Weighted Average Grant Date Fair Value, Vested |  |  |  |  | 10.76 | 10.82
Weighted Average Grant Date Fair Value, Forfeited |  |  |  |  | 0 | 10.87
Weighted Average Grant Date Fair Value, Nonvested at end of period |  |  |  |  | $ 15.60 | $ 10.77

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- Definition Share based compensation arrangement by share based payment award date. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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