Other Long-Term Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Cash surrender value of corporate-owned life insurance policies	$ 4,996	$ 4,654
Deferred commissions	45,663	32,455
Restricted cash	58	62
Operating lease assets	24,732	22,308
Deferred implementation costs	4,132
Prepaid expenses, deposits and other	12,046	8,727
Total other long-term assets	91,627	$ 68,206
Government grant assets	900
Deferred government grant assets	100
Deferred implementation costs assets placed into service	4,300
Other Noncurrent Assets
Grant receivable	$ 500