Deferred Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Summary of Deferred Service Contract Revenue

The following table provides changes in the deferred revenue balance for the three and nine months ended September 30, 2021 and 2020 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Beginning balance	$	11,403	$	11,779	$	11,237	$	14,222
Add: Payments received	3,880		3,854		13,226		9,314
Less: Revenue	(2,576)		(762)		(4,851)		(2,342)
Less: Revenue recognized from beginning balance	(2,027)		(3,047)		(8,932)		(9,370)
Ending balance	$	10,680	$	11,824	$	10,680	$	11,824