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Balance Sheet Details - Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Summary of accrued liabilities |  |
Accrued compensation and related benefits | $ 18,367 | $ 15,563
Accrued warranty and retrofit | 8,097 | 8,708
Accrued professional and consulting fees | 5,349 | 9,604
Accrued restructuring charges | 4,927 | 1,417
Accrued excess and obsolete inventory at contract manufacturers | 3,371 | 2,430
Accrued non-income related taxes | 1,604 | 1,778
Customer over payments | 968 | 1,050
Product return reserve | 959 | 0
Accrued insurance | 717 | 827
Accrued freight | 695 | 593
Accrued business events | 0 | 1,272
Accrued other | 3,729 | 6,037
Total accrued liabilities | $ 48,783 | $ 49,279

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