Income taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets [Abstract]
Provision for doubtful accounts	$ 674	$ 614
Accrued rent	1,308	1,572
Reserve for newsstand returns	168	100
Accrued compensation	3,173	4,854
Deferred royalty revenue	7,741us-gaap_DeferredTaxAssetsDeferredIncome	1,582us-gaap_DeferredTaxAssetsDeferredIncome
NOL/credit carryforwards	46,712	56,567
Depreciation	4,875	5,374
Amortization of intangible assets	5,477	6,054
Other	597us-gaap_DeferredTaxAssetsOther	208us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	70,725us-gaap_DeferredTaxAssetsGross	76,925us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities [Abstract]
Prepaid expenses	(251)	(585)
Amortization of intangible assets	(3,755)	(7,094)
Total deferred tax liabilities	(4,006)us-gaap_DeferredIncomeTaxLiabilities	(7,679)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance	(70,474)	(76,340)
Net Deferred Tax Liabilities	$ 3,755us-gaap_DeferredTaxLiabilities	$ 7,094us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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