Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2021

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,
	2021			2020
Balance at beginning of period	$	7,088		$	764
Deferral of revenue		5			342
Recognition of deferred revenue included in deferred revenue at beginning of period		(638	)		(187	)
Balance at end of period	$	6,455		$	919