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Equity Incentive Plan - Summary of Company's Restricted Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 16, 2017 | May 17, 2016 | Jan. 04, 2016 | Jun. 30, 2017 | Jun. 30, 2017
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 60,605
Expected future compensation expense |  |  |  | $ 416 | $ 416
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 3 years 29 days
Restricted Stock [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Nonvested at beginning of period |  |  |  | 42,138 | 37,050
Number of Restricted Shares, Granted | 6,804 | 12,285 | 2,730 |  | 17,898
Number of Restricted Shares, Vested |  |  |  |  | (12,810)
Number of Restricted Shares, Forfeited |  |  |  | 0 | 0
Number of Restricted Shares, Nonvested at June 30, 2017 |  |  |  | 42,138 | 42,138
Weighted Average Grant Date Fair Value, Nonvested at beginning of period |  |  |  | $ 15.60 | $ 10.77
Weighted Average Grant Date Fair Value, Granted |  |  |  |  | 22.15
Weighted Average Grant Date Fair Value, Vested |  |  |  |  | 10.76
Weighted Average Grant Date Fair Value, Forfeited |  |  |  | 0 | 0
Weighted Average Grant Date Fair Value, Nonvested at June 30, 2017 |  |  |  | $ 15.60 | $ 15.60
Restricted Shares Awarded in 2015 [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 16,699
Expected future compensation expense |  |  |  | $ 18 | $ 18
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 6 months
Restricted Shares Awarded in 2016 [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 15,748
Expected future compensation expense |  |  |  | 50 | $ 50
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 1 year 6 months
Restricted Shares Awarded in 2017 [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 11,713
Expected future compensation expense |  |  |  | 146 | $ 146
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 2 years 6 months
Restricted Shares Awarded in 2018 [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 10,260
Expected future compensation expense |  |  |  | 77 | $ 77
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 3 years 6 months
Restricted Shares Awarded in 2019 [Member] |  |  |  |  |
Schedule Of Nonvested Stock Option Activity [Line Items] |  |  |  |  |
Number of Restricted Shares, Granted |  |  |  |  | 6,185
Expected future compensation expense |  |  |  | $ 125 | $ 125
Expected future compensation expense, restricted shares vesting period |  |  |  |  | 4 years 6 months

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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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