Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Deferred Revenue Disclosure [Abstract]

Summary of Changes in Deferred Revenue

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

	Year Ended December 31,
	2021			2020
Balance at beginning of period	$	7,088		$	764
Deferral of revenue		981			7,139
Recognition of deferred revenue		(7,275	)		(815	)
Balance at end of period	$	794		$	7,088