Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2022

Deferred Revenue Disclosure [Abstract]

Summary of Changes in Deferred Revenue

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

	Three Months Ended March 31,
	2022			2021
Balance at beginning of period	$	794		$	7,088
Deferral of revenue		572			5
Recognition of deferred revenue		(139	)		(638	)
Balance at end of period	$	1,227		$	6,455