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Stock-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 18, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted | 0 | 33,000 | 18,000 |
Exercise of common stock options, shares |  |  | 2,000 |
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares available for issuance under plan | 250,000 |  |  |
Percentage of market value | 85.00% |  |  |
Percentage of employee's payroll deductions limited to employee's compensation | 10.00% |  |  |
Maximum Stock value of shares purchased by employees if one thousand shares purchased | $ 25,000 |  |  |
Maximum number of shares that employee can purchase each period | 250 |  |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash payment of income taxes related to grants included in share-based compensation | $ 0.0 | $ 0.0 | $ 100,000 |
Restricted Stock [Member] | Board of Directors non-employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period |  | 12 months |  |
Restricted stock shares granted |  | 75,000 |  |
Value of restricted stock granted |  | $ 51,000 |  |
Restricted Stock [Member] | Key officers and employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period |  | 48 months |  |
Restricted stock shares granted |  | 300,000 |  |
Value of restricted stock granted |  | $ 900,000 |  |
Stock options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise of common stock options, shares | 0 |  |  |
Unrecognized compensation costs related to non-vested awards granted | $ 1,800,000 |  |  |
2015 Omnibus Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
1995 Stock option expiry date | Jul. 28, 2015 |  |  |
Maximum number of shares available for issuance under plan |  |  |  | 2,125,000
Number of shares available for future grants | 1,700,000 |  |  |
2015 Omnibus Equity Incentive Plan [Member] | Full Value Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award settled against shares | 1.2 |  |  |
2015 Omnibus Equity Incentive Plan [Member] | Partial Value Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award settled against shares | 1.0 |  |  |
2015 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period | 4 years |  |  |
Stock option expiration period | 10 years |  |  |
2015 Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period | 48 months |  |  |
Vested stock options exercised period following termination | 90 days |  |  |
2015 Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period | 12 months |  |  |
2005 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grants | 0 |  |  |
2015 Omnibus Equity Incentive Plan and 2005 Stock Option Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock shares granted | 88,000 |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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