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Future Minimum Payments under Non-Cancelable Portion of Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Operating Leased Assets [Line Items]
2012 (remaining six months)	$ 888
2013	1,785
2014	1,751
2015	1,787
2016	1,824
Thereafter	4,342
Total	$ 12,377

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