Deferred Revenue

3 Months Ended

Mar. 31, 2023

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

Note 9. Deferred Revenue

Deferred revenue, comprising individually immaterial amounts for extended warranty, enhanced product maintenance and advance payments on non-recurring engineering ("NRE") services contracts, represents contracted revenue that has not yet been recognized. We recognized $1.8 million of revenue related to amounts included in deferred revenue as of December 31, 2022 for the three months ended March 31, 2023. We recognized $139,000 of revenue related to amounts included in deferred revenue as of December 31, 2021 for the three months ended March 31, 2022.

The following table presents the changes in deferred revenue for the indicated periods (in thousands):

	Three Months Ended March 31,
	2023			2022
Balance at beginning of period	$	2,599		$	794
Deferral of revenue		29			572
Recognition of deferred revenue		(1,809	)		(139	)
Balance at end of period	$	819		$	1,227