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Acquisition (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 21, 2018
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 28, 2018
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities     $ 700 $ 0  
Property, plant and equipment recognised as of acquisition date     27    
Identifiable intangible assets recognised as of acquisition date     $ 8,545    
weighted average useful life of intangible assets     7 years    
Emza Visual Sense Ltd [Member]          
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination     $ 195    
Technology-based intangible assets recognised as of acquisition date     6,282    
Trademark-based intangible assets recognised as of acquisition date     1,800    
Revenue of acquiree since acquisition date     72    
Profit (loss) of acquiree since acquisition date     (2,858)    
Revenue of combined entity as if combination occurred at beginning of period     723,605    
Profit (loss) of combined entity as if combination occurred at beginning of period     7,291    
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities   $ 2,230      
Cash flows used in obtaining additional control of subsidiaries or other businesses classified as investing activities   $ 270      
Consideration transferred, acquisition-date fair value         $ 6,371
Liabilities incurred         $ 400
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination     $ 1,662    
Nano 3D Mastering Member [Member]          
Consideration transferred, acquisition-date fair value $ 1,400        
Liabilities incurred 700        
Property, plant and equipment recognised as of acquisition date 700        
Identifiable intangible assets recognised as of acquisition date 400        
Prepaid maintenance recognised as of acquisition date $ 300