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Selected Statements of Operations Data (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses $ 2,008 $ 2,678
Overseas travel [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 103
Stock-based compensation [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 246 688
Rent and office maintenance [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 51 49
Payroll and benefits [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 834 470
Professional services and consultation [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 517 953
Taxes and tolls [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 67 24
Director salary and insurance [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses 177 183
Others [Member]    
Research and Development Assets Acquired Other than Through Business Combination [Line Items]    
General and administrative expenses $ 116 $ 208