Nature of Operations and Accounting Policies - Schedule Of Deferred Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Nature Of Operation And Accounting Policies [Abstract]
Balance at beginning of year	$ 3,307	$ 4,755	$ 1,327
Revenues deferred during the year	510	2,042	8,134
Revenues recognized and reclassifications during the year	(3,496)	(3,490)	(4,706)
Balance at end of year	$ 321	$ 3,307	$ 4,755