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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Potentially Dilutive Shares The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share for the period presented due to their anti-dilutive effect:
March 31,
20202019
Stock options to purchase common stock11,627,389  8,939,556  
Restricted stock units subject to vesting2,534,671  1,102,028  
Expected shares to be purchased under Employee Stock Purchase Plan226,459  265,455  
Founder's shares of common stock subject to future vesting12,115,382  18,173,066  
Early exercised stock options subject to future vesting2,678,501  5,020,580  
Total29,182,402  33,500,685