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Acquisition - Additional Information (Detail) (USD $)	1 Months Ended
Acquisition - Additional Information (Detail) (USD $)	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

The fair value of liabilities assumed in noncash investing or financing activities.

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.