Annual report pursuant to Section 13 and 15(d)

Valuation And Qualifying Accounts (Details)

v3.8.0.1
Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Allowance For Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 696 $ 521 $ 718
Charged to costs and expenses 44 213 49
Charged to other accounts
Deductions 108 38 246
Balance at end of period 632 696 521
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 743 1,936 1,788
Charged to costs and expenses 14 220 162
Charged to other accounts
Deductions 432 1,413 14
Balance at end of period 325 743 1,936
Valuation Allowance - Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 640 607 526
Charged to costs and expenses 13,340 33 81
Charged to other accounts
Balance at end of period $ 13,980 $ 640 $ 607