Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets (liabilities):
Deferred revenue	$ 12,639us-gaap_DeferredTaxAssetsDeferredIncome	$ 11,074us-gaap_DeferredTaxAssetsDeferredIncome
Stock compensation	6,287	7,447
Inventory related items	2,713us-gaap_DeferredTaxAssetsInventory	2,947us-gaap_DeferredTaxAssetsInventory
Tax credit carry forwards	2,168	3,160
Reserves and accruals	327	0
Loss carry forwards	12	64
Other, net	0us-gaap_DeferredTaxAssetsOther	5us-gaap_DeferredTaxAssetsOther
Subtotal	24,146us-gaap_DeferredTaxAssetsGross	24,697us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	0	(39)
Total net deferred tax assets	24,146us-gaap_DeferredTaxAssetsNet	24,658us-gaap_DeferredTaxAssetsNet
Intangibles	(26,485)	(26,604)
Depreciation and amortization	(14,331)	(12,077)
Reserves and accruals	0	(353)
Other, net	(194)us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(41,010)us-gaap_DeferredIncomeTaxLiabilities	(39,034)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities	$ (16,864)us-gaap_DeferredTaxLiabilities	$ (14,376)us-gaap_DeferredTaxLiabilities

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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