Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Schedule of Deferred revenue

Revenue recognized from deferred revenue and the corresponding deferred revenue balance for the periods indicated is as follows:

(In thousands)	Year Ended December 31,				At December 31,
	2021		2020		2021		2020
Revenue recognized from deferred revenue	$	95	$	432
Deferred revenue balance					$	4,346	$	4,441