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Stockholders' Equity - Shares Reserved for Issuance (Details) - shares
Jun. 30, 2021
Dec. 31, 2020
Equity [Abstract]    
Stock options issued and outstanding (shares) 2,598,764 1,836,739
Stock options reserved for future grant (shares) 9,451,191 9,414,091
Restricted stock units outstanding 4,257 0
Total shares of common stock reserved (shares) 12,054,212 11,250,830