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Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Patents and Intangibles      
Gross Carrying Amount $ 1,663   $ 1,663
Accumulated Amortization 608   549
Total 1,055   1,114
Total intangible assets (Gross) 2,291   2,229
Total intangible assets (Net) 1,683   1,680
Amortization expense 100 $ 100  
Future Amortization      
2021 (April 1 - December 31) 177    
2022 236    
2023 205    
2024 184    
2025 94    
Thereafter 159    
Total 1,055   1,114
Patents      
Patents and Intangibles      
Patents pending $ 628   $ 566
Patents      
Patents and Intangibles      
Weighted Average Amortization Period 11 years   11 years
Gross Carrying Amount $ 413   $ 413
Accumulated Amortization 74   65
Total 339   348
Future Amortization      
Total $ 339   $ 348
Defensive intangible assets      
Patents and Intangibles      
Weighted Average Amortization Period 4 years   4 years
Gross Carrying Amount $ 1,125   $ 1,125
Accumulated Amortization 464   421
Total 661   704
Future Amortization      
Total $ 661   $ 704
Customer accounts      
Patents and Intangibles      
Weighted Average Amortization Period 2 years   2 years
Gross Carrying Amount $ 125   $ 125
Accumulated Amortization 70   63
Total 55   62
Future Amortization      
Total $ 55   $ 62