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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts $ 0 $ 0
Ordinary shares, par value $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 500,000,000 500,000,000
Ordinary shares, shares issued 351,823,578 351,823,578
Ordinary shares, shares outstanding 347,419,152 332,029,752
Treasury Stock, shares 4,643,150 4,643,150