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Certain transactions (Schedule of Fair Value of Acquired Assets and Assumed Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Jan. 31, 2018
Business Acquisition [Line Items]          
Goodwill $ 11,240 $ 11,240   $ 1,381  
And Co. Ventures Inc          
Business Acquisition [Line Items]          
Cash         $ 574
Deposit         20
Other         9
Goodwill         1,381
Total acquired assets         4,974
Accrued expenses and other payables         84
Total assumed liabilities         84
Net assets acquired         4,890
And Co. Ventures Inc | Developed technology          
Business Acquisition [Line Items]          
Intangible assets         1,320
And Co. Ventures Inc | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets         1,060
And Co. Ventures Inc | Trade name          
Business Acquisition [Line Items]          
Intangible assets         $ 610
Clear Voice, Inc.          
Business Acquisition [Line Items]          
Cash     $ 369    
Accounts receivables and other receivables     523    
Goodwill     9,859    
Total acquired assets     15,511    
Trade payable     91    
Accrued expenses and other payables     844    
Total assumed liabilities     935    
Net assets acquired     14,576    
Clear Voice, Inc. | Developed technology          
Business Acquisition [Line Items]          
Intangible assets     2,600    
Clear Voice, Inc. | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets     1,600    
Clear Voice, Inc. | Trade name          
Business Acquisition [Line Items]          
Intangible assets     $ 560