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Summary of Performance option activity (Detail) - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incentive Stock Options Plans, Additional vesting based on performance | 19,760 |  | 3,900
Performance Based Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incentive Stock Option Plans, Beginning balance | 81,666 |  |
Incentive Stock Options Plans, Additional vesting based on performance | 77,598 | 77,598 |
Incentive Stock Options Plans, Options exercised | (17,839) |  |
Incentive Stock Option Plans, Ending balance | 141,425 |  |
Weighted Average Price Per Share, Beginning balance | $ 11.49 |  |
Weighted Average Price Per Share, Additional vesting based on performance | 11.49 |  |
Weighted Average Price Per Share, Options exercised | 11.49 |  |
Weighted Average Price Per Share, Ending balance | 11.49 |  |
Exercisable Weighted Average Price Per Share, Beginning balance | 11.49 |  |
Exercisable Weighted Average Price Per Share, Ending balance | $ 11.49 |  |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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