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Commitments and Contingencies - Schedule of Future Annual Minimum Lease Payments under Noncancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commitment And Contingencies [Line Items]
2013 (remaining six months)	$ 3,377
2014	3,186
2015	3,109
2016	2,748
2017	2,792
2018 and thereafter	936
Operating Leases, Future Minimum Payments Due, Total	$ 16,148

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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