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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

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