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Redeemable Convertible Preferred Stock - Additional Information (Detail) (Redeemable Convertible Preferred Stock)	1 Months Ended
	Feb. 29, 2012
Redeemable Convertible Preferred Stock
Shareholders Equity [Line Items]
Outstanding redeemable convertible preferred stock converted into shares of common stock	27,897,031

The number of shares converted 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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