Deferred Revenue

6 Months Ended

Jun. 30, 2023

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

Note 10. 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 $2.0 million of revenue related to amounts included in deferred revenue as of December 31, 2022 for the six months ended June 30, 2023. We recognized $270,000 of revenue related to amounts included in deferred revenue as of December 31, 2021 for the six months ended June 30, 2022.

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

	Six Months Ended June 30,
	2023			2022
Balance at beginning of period	$	2,599		$	794
Opening balance from Voyantic acquisition		1,233			—
Deferral of revenue		1,672			2,661
Recognition of deferred revenue		(2,640	)		(459	)
Balance at end of period	$	2,864		$	2,996