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Balance sheet components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Balance sheet components    
Prepaid taxes and taxes receivable $ 13,015 $ 16,102
Deposits and other prepaid expenses 4,279 3,571
Transition service agreement related (Note 5) 14,409  
Other receivable 5,063 2,723
Prepaid expenses and other current assets $ 36,766 $ 22,396