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Stock-Based Compensation - Non-vested Stock Option Activity (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Options |  |  |
Outstanding at beginning of year (in shares) | 1,546,500 | 1,688,500 | 1,914,000
Granted (in shares) | 126,000 | 94,500 | 80,000
Outstanding at end of year (in shares) | 1,191,125 | 1,546,500 | 1,688,500
Weighted- Average Exercise Price |  |  |
Granted (in dollars per share) | $ 1.54 | $ 2.20 | $ 1.79
Non-Vested Stock Options |  |  |
Number of Options |  |  |
Outstanding at beginning of year (in shares) | 0 |  |
Granted (in shares) | 126,000 |  |
Vested (in shares) | (126,000) |  |
Forfeited (in shares) | 0 |  |
Outstanding at end of year (in shares) | 0 | 0 |
Weighted- Average Exercise Price |  |  |
Outstanding at beginning of year (in dollars per share) | $ 0.00 |  |
Granted (in dollars per share) | 1.54 |  |
Vested (in dollars per share) | 1.54 |  |
Forfeited (in dollars per share) | 0.00 |  |
Outstanding at end of year (in dollars per share) | $ 0.00 | $ 0.00 |

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- Definition The weighted average grant-date fair value of options forfeited during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options outstanding as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Number of options vested during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options vested during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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