Revenue - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 172,652	$ 557,240	$ 636,354	$ 691,545
Americas
Disaggregation of Revenue [Line Items]
Total revenue		280,028	323,085	344,650
EMEA
Disaggregation of Revenue [Line Items]
Total revenue		213,575	240,403	237,462
APAC
Disaggregation of Revenue [Line Items]
Total revenue		63,637	72,866	109,433
United States (Included in Americas above)
Disaggregation of Revenue [Line Items]
Total revenue		$ 275,145	$ 313,910	$ 336,496
Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percentage)		13.00%	11.00%	13.00%