Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill Changes In Intangible Assets (Details)

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Intangible Assets and Goodwill Changes In Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangibles $ 1,212 $ 1,928 $ 2,101
Original cost 15,195 15,021  
Accumulated amortization (12,120) (10,774)  
Net identifiable intangible assets 3,075 4,247  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Original cost 4,878 4,818  
Accumulated amortization (3,293) (2,721)  
Net identifiable intangible assets 1,585 2,097  
Developed technology      
Finite-Lived Intangible Assets [Line Items]      
Original cost 8,135 8,023  
Accumulated amortization (7,741) (7,110)  
Net identifiable intangible assets 394 913  
Trademarks / trade names      
Finite-Lived Intangible Assets [Line Items]      
Original cost 2,182 2,180  
Accumulated amortization (1,086) (943)  
Net identifiable intangible assets $ 1,096 $ 1,237