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Stock-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 18, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise of common stock options, shares |  | 2,000 | 1,000 |
Weighted average grant-date fair value of stock options granted | $ 2.36 | $ 5.08 | $ 3.80 |
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 | $ 100,000 | $ 200,000 |
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 |  | $ 2,100,000 |  |
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] | Not Full 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] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period | 12 months |  |  |
2015 Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock vesting period | 48 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 | 375,000 |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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