Significant Customers - Additional Information (Detail)	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011 Customer
Segment Reporting Disclosure [Line Items]
Number of major customer by revenue		1
Revenue from major customers description	The Company did not have any customers that accounted for more than 10% of revenues in the three months ended December 31, 2012.	The Company had one customer that accounted for more than 10% of revenues, at 13%, in the three months ended December 31, 2011.
Percentage of revenues from one customer		13.00%

Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 39

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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