Supplemental Balance Sheet Information - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance for doubtful accounts
Balance, beginning of period	$ 13,391	$ 9,085	$ 12,046	$ 6,287
Additions	5,987	2,899	9,368	7,160
Write-offs	(3,965)	(1,736)	(6,001)	(3,199)
Balance, end of period	$ 15,413	$ 10,248	$ 15,413	$ 10,248