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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Tax Assets Liabilities [Line Items]          
Valuation allowance, deferred tax assets $ 11,480,000 $ 20,214,000 $ 11,480,000    
Deferred tax assets valuation allowance increase 1,489,000 10,241,000      
Amount generate in cash refund   1,600,000      
Increases in equity of realization of deferred tax assets   2,804,000      
Unremitted earnings of international subsidiaries   2,810,000      
Unrecognized deferred tax liability   219,000      
Research tax credit carryforward extension period   2 years      
Federal research tax credit recorded   549,000      
Accrued interest 1,506,000 2,072,000 1,506,000 1,405,000 1,102,000
Potential payment of interest 177,000 149,000 177,000    
Net interest (benefit) expense   $ (28,000) $ 32,000 $ 68,000  
Minimum [Member]
          
Deferred Tax Assets Liabilities [Line Items]          
Income tax examination period   3 years      
Maximum [Member]
          
Deferred Tax Assets Liabilities [Line Items]          
Income tax examination period   7 years      
Domestic Tax Authority [Member]
          
Deferred Tax Assets Liabilities [Line Items]          
Federal net operating loss carryforwards expired   2033