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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 3,624		$ 3,624		$ 3,443
Unearned revenue	21,856		21,856		$ 14,101
Prior year unearned revenue recognized in period			9,900
Share-based compensation costs	$ 3,600	$ 3,000	$ 18,300	$ 10,200
Antidilutive securities excluded from computation of Earnings Per Share, amount			0.1	0.5

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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