Income Taxes - Reconciliation of the statutory tax rate to effective tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Loss before tax:	$ (109,109)	$ (200,776)	$ (236,513)
RATE
Statutory rate	19.00%	19.00%	19.00%
Effect of different tax rates	5.80%	(4.40%)	(1.20%)
Valuation Allowances	(28.40%)	(17.80%)	(18.00%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	21.30%	(0.20%)	(0.30%)
Other permanent differences	(3.50%)	(1.10%)	(0.40%)
Non-deductible transaction costs	(4.60%)	(2.10%)	0.00%
Withholding tax	(0.50%)	(0.70%)	(0.20%)
Tax indemnity	0.00%	3.70%	(2.70%)
Sale of Subsidiary	0.00%	0.00%	2.20%
Other	(0.40%)	(0.30%)	(0.80%)
Effective rate	2.60%	(5.10%)	(2.40%)
Effective Income Tax Rate Reconciliation Change In Base Erosion And Anti Abuse Tax Rate Percent	(6.10%)	(1.20%)	0.00%
Income Tax Expense (Benefit)	$ (2,799)	$ 10,201	$ 5,649