Leases - Operating Leases - Data Center Colocation Lease (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating leases
Operating lease right-of-use assets		$ 17,447	$ 17,743
Operating lease liability		$ 23,522
Asset impairment charge
Weighted-average discount rate of operating leases (as a percent)	6.70%	5.80%
Data Center Lease, Boston, Massachusetts
Operating leases
Annual rent escalation (as a percent)		4.00%
Operating lease right-of-use assets				$ 600
Operating lease liability		$ 400	$ 400	$ 600
Asset impairment charge
Weighted-average discount rate of operating leases (as a percent)		6.00%
Data Center Lease, Boston, Massachusetts | Selling, general and administrative
Asset impairment charge
Asset impairment charge	$ 500