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Intangible assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Identifiable intangible assets [Abstract]    
Gross amount $ 1,606 $ 4,588
Accumulated amortization (1,209) (4,005)
Amortization expense 186 234
Future amortization expense [Abstract]    
2022 155  
2023 154  
2024 88  
Thereafter 0  
Purchased Technology [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 1,591 2,526
Accumulated amortization (1,195) (1,975)
Customer Relationships [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 0 1,300
Accumulated amortization 0 (1,300)
Trademark [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 0 480
Accumulated amortization 0 (450)
Covenant Not to Compete [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 0 146
Accumulated amortization 0 (146)
Patents [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 15 56
Accumulated amortization (14) (54)
Other [Member]    
Identifiable intangible assets [Abstract]    
Gross amount 0 80
Accumulated amortization $ 0 $ (80)