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CONDENSED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2022
Dec. 31, 2021
Common stock par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 400,000,000  
Common stock, shares issued (in shares) 145,981,180 145,971,184
Common stock, shares outstanding (in shares) 145,981,180 145,971,184
Class A-1 Convertible Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 256,700 256,700
Preferred stock, shares issued (in shares) 256,700 256,700
Preferred stock, shares outstanding (in shares) 256,700 256,700
Class A-2 Convertible Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 1,330,832 1,330,832
Preferred stock, shares issued (in shares) 1,330,832 1,330,832
Preferred stock, shares outstanding (in shares) 1,330,832 1,330,832
Class A-3 Convertible Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 258,707 258,707
Preferred stock, shares issued (in shares) 258,707 258,707
Preferred stock, shares outstanding (in shares) 258,707 258,707
Class A-4 Convertible Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 3,725,720 3,725,720
Preferred stock, shares issued (in shares) 3,725,720 3,725,720
Preferred stock, shares outstanding (in shares) 3,725,720 3,725,720