Annual report pursuant to Section 13 and 15(d)

Income Taxes - Actual Income Tax Provision (Benefit) Differs from Amount Computed Using Federal Statutory Rate (Detail)

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Income Taxes - Actual Income Tax Provision (Benefit) Differs from Amount Computed Using Federal Statutory Rate (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Reconciliation [Line Items]      
Provision (benefit) at statutory rate $ (4,390) $ (5,111) $ 1,273
State income taxes (net of federal benefit) (1,247) 24 336
Research and development credits (858) (3,320) (1,078)
Foreign rate differential 445 1,182 262
Stock compensation 278 974 959
Foreign dividend   94 46
Estimated export compliance fines and penalties (255) 255  
Foreign tax credit   (236)  
Permanent and other 154 260 (940)
Valuation allowance 6,214 12,871 (7,229)
Total income tax provision (benefit) $ 341 $ 6,993 $ (6,371)