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Common stock (Tables)
12 Months Ended
Dec. 31, 2022
Common stock.  
Schedule of shares reserved for future issuance

As of December 31, 

    

2022

    

2021

 

Shares reserved for vesting of restricted stock awards under the Founder Agreements

 

45,000

137,255

Shares reserved for exercise of outstanding stock options

 

6,199,571

5,013,193

 

Shares reserved for vesting of outstanding restricted stock units

 

1,112,563

806,379

 

Shares reserved for issuances under the 2015 Stock Option Plan

3,536,932

4,374,539

Shares reserved for issuances under the 2015 Employee Stock Purchase Plan

1,884,309

1,659,574

 

12,778,375

11,990,940