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Balance sheet components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]      
Prepaid taxes and taxes receivable $ 4,117   $ 5,461
Transition services agreement receivable (see Note 6) 12,263   11,999
Deposits and other prepaid expenses 2,913   3,020
Other receivable 4,702   6,125
Prepaid expenses and other current assets 23,995   $ 26,605
Capital expenditures incurred but not yet paid $ 1,800 $ 3,500