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Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Line Items]        
Marketable securities $ 0 $ 14,847    
Cash 127,400 145,900    
Cash and cash equivalents 146,871 150,301 $ 43,016 $ 152,095
Fair Value, Recurring [Member]        
Cash and Cash Equivalents [Line Items]        
Marketable securities $ 0 $ 14,847