Commitments and Contingencies - Reorganization (Details) - Employee Severance [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 8,514
Restructuring Reserve	$ 6,403	6,403	$ 28
Payments for Restructuring		(2,139)
Reorganization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	8,500	8,500
Sales and marketing | Reorganization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	5,300	5,300
Technology and development | Reorganization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	1,600	1,600
General and administrative | Reorganization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	900	900
Cost of revenue | Reorganization Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 700	$ 700