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CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Stock issuance expenses $ 800 $ 776 $ 93
Series D Convertible Preferred Stock      
Discount of issuance of common stock, preferred stock and warrants for clinical trial funding commitment     $ 488