Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Recognition [Abstract]
Revenue Recognized	$ 37,522,000	$ 19,595,000
Impairment losses on contract assets	0	0
Commissions and related payroll tax expenditures	2,289,000	1,333,000
Amortization, sales and marketing expenses	1,666,000	769,000
Deferred costs	3,152,000	3,026,000
Other assets	$ 6,600,000	$ 6,581,000