Revenue Recognition, Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Contract with Customer, Liability [Abstract]
Short-term contract liabilities	$ 464		$ 464
Long-term contract liabilities	277		277
Change in Contract with Customer, Liability [Abstract]
Contract liabilities recognized as revenue	$ 225	$ 20	$ 638	$ 54