Income Taxes - Reconciliation of Income Tax Computed at Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax (benefit) expense at statutory tax rate	$ (3,844)	$ 1,214	$ 2,664
State (benefit) taxes, net of federal tax (benefit)	(151)	63	239
Permanent differences	70	(76)	26
Federal and state research credits—current year	(765)	(1,046)	(370)
Federal research credits - prior year	0	(527)	0
(Release) accrual of uncertain tax positions	(21)	369	(106)
Expiration of statutes for uncertain tax positions	(953)	(3,452)	0
Foreign effective tax rate differential	(18)	(6)	0
Impact of change in federal and state tax rate on revaluing deferred tax assets	110	(581)	75
Change in valuation allowance	2,331	0	0
Acquisition related adjustments	(485)	0	0
Other	(183)	86	90
(Benefit) provision for income taxes	$ (3,909)us-gaap_IncomeTaxExpenseBenefit	$ (3,956)us-gaap_IncomeTaxExpenseBenefit	$ 2,618us-gaap_IncomeTaxExpenseBenefit

Income tax reconciliation impact of change in federal and state tax rate on revaluing deferred tax assets.

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Income tax reconciliation permanent difference.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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 the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income 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 revisions of previously reported income tax expense (benefit).

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Amount of other current and other deferred income tax expense (benefit) attributable to continuing operations.

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Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.

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