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Stock-Based Compensation - Additional Information (Detail) | 6 Months Ended |  |  | 6 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2013 Incentive Stock Option Plan [Member] | May 31, 2013 Incentive Stock Option Plan [Member] | Jun. 30, 2013 Incentive Stock Option Plan [Member] Minimum [Member] | Jun. 30, 2013 Non Employee Directors Stock Option Plan [Member] | May 31, 2009 Non Employee Directors Stock Option Plan [Member] | Jun. 30, 2013 Non Employee Directors Stock Option Plan [Member] Minimum [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 |  |  | 205,000 |
Shares for future grants |  | 185,860 |  |  | 15,000 |  |
Option exercisable rate |  | 25.00% |  |  | 25.00% |  |
Options expire period |  | 15 years |  |  | 15 years |  |
Share based compensation options exercisable period |  | 2020 |  |  | 2017 |  |
Stock price percentage to fair value at grant date |  |  |  | 100.00% |  |  | 100.00%
Vesting period in years |  | 7 years |  |  | 4 years |  |
Options Exercisable Description |  | The options are exercisable beginning one year from the date of grant at the rate of 25% per year for four years, and expire at the end of fifteen years from the date of grant. |  |  | The options are exercisable beginning four years from the date of grant at the rate of 25% per year for four years |  |
Stock option plan termination date |  | Dec. 31, 2014 |  |  |  |  |
Number of options granted for non-employee director | 10,000 |  |  |  |  |  |

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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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