Revenues and Accounts Receivable - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues And Accounts Receivable [Abstract]
Accounts receivable, invoiced	$ 64,314	$ 57,228
Accounts receivable, other	5,766	1,139
Allowance for doubtful accounts	(4,309)	(4,265)	$ (1,327)
Accounts receivable—net	$ 65,771	$ 54,102