Deferred Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Deferred commissions
As of beginning of period	$ 14,718
Additions	318
Expense recognized	(2,383)
As of end of period	12,653
Deferred professional service costs
As of beginning of period	6,711
Additions	434
Expense recognized	(925)
As of end of period	6,220
Total deferred commissions and professional service costs
As of beginning of period	21,429
Additions	752
Expense recognized	(3,308)
As of end of period	18,873
Impairment charges	$ 1,100