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Income taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current deferred tax asset	$ 1,913us-gaap_DeferredTaxAssetsNetCurrent	$ 1,913us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred tax liability	$ 1,913	$ 1,913

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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