Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 524	$ 344	$ 370	$ 417	$ 361	$ 328	$ 475	$ 282	$ 1,655	$ 1,446
France [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									142	9
Romania [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									100	28
Spain [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									65	65
All other foreign countries [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									33	59
Japan [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									10	31
Foreign [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									460	308
Domestic [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									1,195	1,138
India [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									31	56
Norway [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									25	31
Canada [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations									$ 54	$ 29