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Balance sheet components - Estimated future amortization expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Purchased intangible assets    
2016 (remaining nine months) $ 3,140  
2017 1,368  
2018 1,179  
2019 800  
2020 689  
Thereafter 1,523  
Net Assets $ 8,699 $ 9,852