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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Income tax (benefit) expense	$ (2,259,000)	$ 623,000	$ (1,044,000)	$ 3,524,000
Income tax provision	(60.70%)	16.00%	(38.00%)	31.10%
Tax benefit of selling and administrative income tax credits	600,000
Tax benefit of research and development income tax credits	500,000		2,900,000
Liability for uncertain tax positions totaled	$ 653,000		$ 653,000		$ 162,000

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Percentage Of Income Tax Provision Benefit

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- Definition

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

-Section S99

-Paragraph 1

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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

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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 other nondeductible expenses.

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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 nondeductible research and development expense.

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