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Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 30, 2017
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Accrued Liabilities [Abstract] |  |
Related party payable | $ 10,632 | $ 4,292
Accrued indirect taxes payable | 7,465 | 6,711
Accrued GPO fees | 3,064 | 2,351
Related party payable | 2,129 | 1,528
Accrued legal fees | 1,546 | 975
Accrued warranty | 1,140 | 1,149
Accrued donations | 346 | 548
Accrued stock repurchases | 0 | 1,988
Other | 4,502 | 4,712
Total accrued and other current liabilities | $ 30,824 | $ 24,254

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