| Acquisition - Additional Information (Detail) (USD $) | 1 Months Ended | |
|---|---|---|
| Nov. 30, 2012 | Oct. 31, 2012 | |
| Business Acquisition [Line Items] | ||
| Asset purchase, cash paid | $ 3,500,000 | |
| Intangible asset acquired | 3,500,000 | |
| Assumed liability | $ 150,000 | |
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- Details 
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- Definition The fair value of liabilities assumed in noncash investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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