Preferred Stock Warrant Liability - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2011
Temporary Equity [Abstract]
Conversion of convertible preferred stock warrants to common stock and common stock warrants	$ 6,598,000
Loss from change in fair value of warrant liability	$ 3,600,000

Adjustments To Additional Paid In Capital Conversion Of Redeemable Preferred Stock Warrants

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration