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CONDENSED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, par value (in USD per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 39,552,000 36,781,000
Common stock, shares outstanding (in shares) 39,552,000 36,781,000