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Future Minimum Payments under Non-Cancelable Portion of Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Operating Leased Assets [Line Items]
2012 (remaining three months)	$ 450
2013	1,799
2014	1,763
2015	1,799
2016	1,836
Thereafter	4,417
Total	$ 12,064

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