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Employee Stock Purchase Plan - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Aug. 16, 2014 Employee Stock Purchase Plan [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Percentage of discount from market price of shares |  |  | 85.00% |
Maximum limit of payroll deductions |  |  | 10.00% |
Number of shares issue that the ESPP authorizes for purchase by eligible employees |  |  |  | 1,500,132
Total fair value of awards recognized as expenses | $ 26,218 | $ 26,218 |  |

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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 Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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