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Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Shareholders' Equity  
Reserved Shares of Common Stock

Options granted and outstanding

    

11,938,528

Options available for future grant

 

4,089,584

Common stock warrants

 

243,115

Total shares reserved

 

16,271,227

Schedule of Stockholders' Equity Note, Warrants or Rights

Outstanding At

    

    

December 31, 2020

Expiration Date

Exercise Price

43,115

May 18, 2023

$

9.94

200,000

April 12, 2023

$

23.00