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Net loss per share - Basic and Diluted Net Income per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 12, 2017
Earnings Per Share [Abstract]        
Treasury Shares Acquired, Estimated, Prepaid Forward 9,200      
Numerator:        
Net loss $ (66,783) $ (14,642) $ (109,034)  
Denominator:        
Earnings Per Share, Basic and Diluted $ (0.45) $ (0.10) $ (0.78)  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Own-share Lending Arrangement, Shares, Issued       9,200
Treasury Shares Acquired, Estimated, Prepaid Forward 9,200      
Weighted Average Number of Shares Outstanding, Basic and Diluted 149,037 144,891 139,495