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Intangible Assets - Schedule of Amortizable Purchased Intangible Assets from Acquisition (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Gross $ 42,520,000 $ 42,520,000
Accumulated Amortization (10,528,000) (9,856,000)
Accumulated Impairment (29,749,000) (29,749,000)
Net 2,243,000 2,915,000
Developed technologies [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross 26,000,000 26,000,000
Accumulated Amortization (6,036,000) (5,786,000)
Accumulated Impairment (19,547,000) (19,547,000)
Net 417,000 667,000
Trade name [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross 12,800,000 12,800,000
Accumulated Amortization (2,536,000) (2,147,000)
Accumulated Impairment (8,582,000) (8,582,000)
Net 1,682,000 2,071,000
Other [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross 3,720,000 3,720,000
Accumulated Amortization (1,956,000) (1,923,000)
Accumulated Impairment (1,620,000) (1,620,000)
Net $ 144,000 $ 177,000