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Selected Statements Of Operations Data (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses $ (2,936) $ (1,031)
Overseas travel [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 118 72
Share-based payment [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 783
Rent and office maintenance [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 46 53
Payroll and benefits [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 518 300
Professional services and consultation [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 1,051 472
Taxes and tolls [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 16 46
Director salary and insurance [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 191 63
Others [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses $ 213 $ 25