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SIGNIFICANT ACCOUNTING POLICIES - Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Purchased intangible assets    
Weighted average amortization period 8 years  
Gross $ 54,796 $ 58,069
Accumulated Amortization (48,916) (49,480)
Net 5,880 8,589
Expected future amortization of intangible assets    
2020 1,126  
2021 872  
2022 692  
2023 692  
2024 676  
Thereafter 1,822  
Net $ 5,880 8,589
Core technology    
Purchased intangible assets    
Weighted average amortization period 8 years  
Gross $ 17,717 18,916
Accumulated Amortization (11,837) (10,866)
Net 5,880 8,050
Expected future amortization of intangible assets    
Net $ 5,880 8,050
Customer relationships    
Purchased intangible assets    
Weighted average amortization period 4 months  
Gross $ 35,091 37,122
Accumulated Amortization (35,091) (36,583)
Net 0 539
Expected future amortization of intangible assets    
Net 0 539
Trademarks / Trade names    
Purchased intangible assets    
Gross 1,988 2,031
Accumulated Amortization (1,988) (2,031)
Net 0 0
Expected future amortization of intangible assets    
Net $ 0 $ 0