Revenue and Cost of Revenues - Cost of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Product Information [Line Items]
Cost of revenues	$ 109,836	$ 78,545	$ 303,199	$ 222,327
Asset-based
Product Information [Line Items]
Cost of revenues	102,298	71,133	281,829	201,600
Subscription-based
Product Information [Line Items]
Cost of revenues	7,355	7,291	20,986	20,375
Professional services and other
Product Information [Line Items]
Cost of revenues	$ 183	$ 121	$ 384	$ 352