Provision for Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Increase in valuation allowance	$ 6,400,000
Deferred tax assets:
NOL and credit carryforwards	16,340,000	21,328,000
Deferred revenue	1,596,000us-gaap_DeferredTaxAssetsDeferredIncome	2,657,000us-gaap_DeferredTaxAssetsDeferredIncome
Accrued expenses and other	3,295,000	3,386,000
Stock-based compensation	209,000	1,107,000
Total deferred tax assets	21,440,000us-gaap_DeferredTaxAssetsGross	28,478,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Deferred expenses	(3,924,000)	(5,128,000)
Depreciation and amortization	(3,573,000)	(2,972,000)
Total deferred tax liabilities	(7,497,000)us-gaap_DeferredIncomeTaxLiabilities	(8,100,000)us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets less tax liabilities	13,943,000	20,378,000
Less: valuation allowance	(13,828,000)	(20,266,000)
Net deferred tax asset	115,000us-gaap_DeferredTaxAssetsLiabilitiesNet	112,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Excess stock deductions excluded from deferred tax assets	$ 9,900,000

Deferred Tax Assets, Excess Stock Deductions Excluded

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Deferred Tax Assets Less Deferred Tax Liabilities Before Allocation of Valuation Allowance

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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