Deferred Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Deferred commissions
As of beginning of period		$ 14,718
Additions		920
Expense recognized		(3,919)
As of end of period	$ 11,719	11,719
Deferred professional service costs
As of beginning of period		6,711
Additions		663
Expense recognized		(1,657)
As of end of period	5,717	5,717
Total deferred commissions and professional service costs
As of beginning of period		21,429
Additions		1,583
Expense recognized		(5,576)
As of end of period	17,436	17,436
Impairment charges	$ 200	$ 1,300