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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]          
Income tax expense $ 51,000 $ 1,535,000 $ 1,215,000 $ 2,901,000  
Income tax provision     18.80% 39.00%  
EffectiveTaxRateBeforeTaxCredit     40.00% 39.00%  
Tax benefit of selling and administrative income tax credits 400,000        
Tax benefit of research and development income tax credits     600,000 600,000  
Liability for uncertain tax positions totaled $ 475,000   $ 475,000   $ 162,000