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Future Minimum Payments under Non-Cancelable Portion of Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
2013	$ 2,064
2014	2,210
2015	2,260
2016	2,311
2017	2,360
Thereafter	3,727
Total	$ 14,932

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