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Summary of Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Founder's receivable		$ 5,267	$ 5,267	$ 5,267
Other	5,675	4,616	3,311	429
Total prepaid expenses and other current assets	$ 5,675	$ 9,883	$ 8,578	$ 5,696

The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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