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Balance Sheet Components - Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Accrued compensation and benefits $ 11,745 $ 9,015
Accrued tax liabilities 3,234 2,156
Other 4,666 4,343
Total accrued liabilities $ 19,645 $ 15,514