Income Taxes - Schedule of Reconciliation of Income Tax Provision and 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 expense at statutory rate	$ 5,675	$ 2,194	$ 5,223
Increase (decrease) in tax resulting from:
State income tax, net of federal benefit	416	311	694
Domestic Production Activities deduction	(670)	(295)	(415)
Change in uncertain tax position reserves	388	599	110
Permanent differences	58	510
Impact of foreign rate differences and adjustments	296	(295)	(94)
Current and prior years R&D tax credits	(3,026)	(3,649)	(1,100)
Other		112	95
Non-deductible transaction costs		411
Income tax provision from continuing operations	$ 3,137us-gaap_IncomeTaxExpenseBenefit	$ (102)us-gaap_IncomeTaxExpenseBenefit	$ 4,513us-gaap_IncomeTaxExpenseBenefit

Income tax reconciliation permanent differences.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Number 210

-Section 08

-Paragraph h

-Article 4

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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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 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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