Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Unsatisfied performance obligation	$ 52,800		$ 52,800
Allowance for doubtful accounts	3,709		3,709		$ 3,346
Unearned revenue	34,510		34,510		$ 10,704
Prior year unearned revenue recognized in period			9,200
Share-based compensation costs	$ 3,000	$ 2,000	$ 10,200	$ 10,500
Antidilutive securities excluded from computation of Earnings Per Share, amount			0.5	1.4