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INTANGIBLE ASSETS, NET (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost:      
Intangible assets, gross $ 31,537 $ 31,537  
Less accumulated amortization 11,696 7,108  
Intangible assets, net 19,841 24,429  
Amortization expense 4,588 2,784 $ 2,753
Technology-Based Intangible Assets [Member]      
Cost:      
Intangible assets, gross 8,275 8,275  
Customer Relationships [Member]      
Cost:      
Intangible assets, gross 10,667 10,667  
Customer data [Member]      
Cost:      
Intangible assets, gross 12,043 12,043  
Domain [Member]      
Cost:      
Intangible assets, gross 552 $ 552  
DeviantArt's Technology [Member]      
Cost:      
Amortization expense $ 1,206