Annual report pursuant to Section 13 and 15(d)

Consolidated Valuation and Qualifying Accounts and Reserves (Detail)

v3.7.0.1
Consolidated Valuation and Qualifying Accounts and Reserves (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 1,765 $ 1,711 $ 573
Charges (Reversals) to Cost or Expenses (438) 86 1,261
Deductions (118) (32) (123)
Balance at End of Year 1,209 1,765 1,711
Allowance for sales returns      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 210 110 110
Charges (Reversals) to Cost or Expenses   100  
Balance at End of Year 210 210 110
Allowance for tax valuation      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 49,514 42,069 35,566
Charges (Reversals) to Cost or Expenses 4,796 7,445 6,503
Balance at End of Year $ 54,310 $ 49,514 $ 42,069