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Redeemable Convertible Preferred Stock and Redeemable Common Stock - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2008	Aug. 31, 2008
Temporary Equity [Line Items]
Number of redeemable convertible preferred stock sold by company		427,985
Number of common stock owned by the investor	3,189,648

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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