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Balance Sheets and Statements of Operations Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accrued Liabilities, Current [Abstract]    
Accrued compensation and benefits $ 19,808 $ 18,134
Accrued tax liabilities 2,062 4,520
Other 6,960 5,103
Total accrued liabilities $ 28,830 $ 27,757