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Commitments and contingencies - Future Minimum Rental Payments under Noncancellable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Schedule Of Operating Leases [Line Items]
2013	$ 266
2014	232
2015	198
2016
2017
Operating leases, Total	$ 696

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Amount of required minimum rental payments maturing in the fifth 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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