Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Additions charged to expenses $ 132    
Balance at end of year 132    
Inventory reserves [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 117 148 120
Additions charged to expenses 127 61 85
(Deductions) (92) (92) (57)
Balance at end of year 152 117 148
Valuation allowance for deferred tax assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 16,029 3,132 10,361
Additions charged to expenses 6,214 12,897  
(Deductions)     (7,229)
Balance at end of year $ 22,243 $ 16,029 $ 3,132