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Future Minimum Payments under Non-Cancelable Portion of Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Operating Leased Assets [Line Items]
2013 (remaining months)	$ 1,595
2014	2,193
2015	2,243
2016	2,294
2017	2,343
Thereafter	3,638
Total	$ 14,306

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