Quarterly report pursuant to Section 13 or 15(d)

BALANCE SHEET COMPONENTS Balance Sheet Components (Details)

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BALANCE SHEET COMPONENTS Balance Sheet Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 136,261 $ 125,921 $ 109,649 $ 104,914
Accrued Sales Returns 2,301 1,632    
Accrued Employee Benefits, Current 6,087 10,541    
Accrued Warehousing And Inventory Related Expense 1,978 2,816    
Other Accrued Liabilities, Current 10,366 14,989    
Cash Equivalents [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 73,225 73,468    
Cash [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 63,036 $ 52,453