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Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations $ 7,434 $ 6,882 $ 15,542 $ 13,418
Malaysia [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 1,231 433 2,524 1,042
Hong Kong [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 139 166 376 355
Germany [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 90 204 242 286
Australia [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 5 189 5 189
All other foreign countries [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 460 405 1,174 873
Foreign [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations 1,925 1,397 4,321 2,745
Domestic [Member]        
Entity Wide Revenue Major Customer [Line Items]        
Revenues from operations $ 5,509 $ 5,485 $ 11,221 $ 10,673