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Balance Sheets and Statements of Operations Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accrued Liabilities, Current [Abstract]    
Accrued compensation and benefits $ 14,459 $ 14,447
Accrued tax liabilities 2,753 2,554
Other 3,748 5,434
Total accrued liabilities $ 20,960 $ 22,435