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Stock-Based Compensation - Additional Information (Detail) - shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | May. 31, 2014 | May. 31, 2013
Non-Employee [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of options granted for non-employee director | 10,000 |  |
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [ Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of shares to be issued under incentive stock option plan |  |  | 3,000,000
Shares for future grants | 39,485 |  |
Stock option plan termination date | Dec. 31, 2019 |  |
Option exercisable rate | 25.00% |  |
Option exercisable period | 4 years |  |
Options expire period | 15 years |  |
Vesting period in years, start | 4 years |  |
Share based compensation options exercisable period | 2022 |  |
Options vest and exercisable Description | The options are exercisable beginning four years from the date of grant at the rate of 25% per year for four years. Options expire at the end of fifteen years from the date of grant |  |
Vesting period in years | 7 years |  |
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [ Member] | Minimum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock price percentage to fair value at grant date | 100.00% |  |
Non-Employee Directors Stock Option Plan [ Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of shares to be issued under incentive stock option plan |  | 230,000 |
Shares for future grants | 20,000 |  |
Option exercisable rate | 25.00% |  |
Option exercisable period | 1 year |  |
Options expire period | 15 years |  |
Share based compensation options exercisable period | 2018 |  |
Options vest and exercisable Description | The options are exercisable beginning one year from the date of grant at the rate of 25% per year for four years |  |
Vesting period in years | 4 years |  |
Non-Employee Directors Stock Option Plan [ Member] | Minimum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock price percentage to fair value at grant date | 100.00% |  |

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- Definition The number of years before the option is 25% vested and exercisable. + References No definition available. + 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=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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