Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill Amortization expense (Details)

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Intangible Assets and Goodwill Amortization expense (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
Cost of revenues      
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangibles 455 1,024 1,197
Operating expenses      
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangibles $ 757 $ 904 $ 904