Income Taxes - Components of Company's Income Tax Provision (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense:
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	377	234	263
Foreign	68us-gaap_CurrentForeignTaxExpenseBenefit	95us-gaap_CurrentForeignTaxExpenseBenefit	93us-gaap_CurrentForeignTaxExpenseBenefit
Total	445us-gaap_CurrentIncomeTaxExpenseBenefit	329us-gaap_CurrentIncomeTaxExpenseBenefit	356us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit):
Federal	2,092	5,088	1,178
State	709	748	173
Foreign	301
Change in valuation allowance		(36,226)	(1,323)
Total	3,102us-gaap_DeferredIncomeTaxExpenseBenefit	(30,390)us-gaap_DeferredIncomeTaxExpenseBenefit	28us-gaap_DeferredIncomeTaxExpenseBenefit
Unrecognized tax benefit	(370)	(28)	17
Income tax provision (benefit)	$ 3,177us-gaap_IncomeTaxExpenseBenefit	$ (30,089)us-gaap_IncomeTaxExpenseBenefit	$ 401us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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