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Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of Outstanding Potentially Dilutive Securities Excluded in Calculation of Diluted Net Loss Per Share The following table sets forth the outstanding, potentially dilutive securities that have been excluded in the calculation of diluted net loss per share because their inclusion would be anti-dilutive:
As of September 30,
20202019
Common stock options
3,717,406 2,481,403 
Warrants to purchase common stock
2,349,595 125,333 
Employee stock purchase program341,930 — 
Total
6,408,931 2,606,736