Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Summary of Deferred Service Contract Revenue

The following table provides changes in the deferred contract revenue balance for the years ended December 31, 2021 and 2020 (in thousands):

	December 31,
	2021		2020
Balance at beginning of year	$	11,237	$	14,222
Add: Payments received	17,139		14,131
Less: Revenue recognized from current period sales	(7,006)		(6,337)
Less: Revenue recognized from beginning balance	(10,545)		(10,779)
Balance at end of year	$	10,825	$	11,237