PURCHASED INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Purchased intangible assets
Gross	$ 57,100	$ 58,069
Accumulated Amortization	(49,218)	(49,480)
Net	7,882	8,589
Core technology
Purchased intangible assets
Gross	18,564	18,916
Accumulated Amortization	(10,903)	(10,866)
Net	7,661	8,050
Customer relationships
Purchased intangible assets
Gross	36,544	37,122
Accumulated Amortization	(36,323)	(36,583)
Net	221	539
Trademarks / Trade names
Purchased intangible assets
Gross	1,992	2,031
Accumulated Amortization	(1,992)	(2,031)
Net	$ 0	$ 0

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