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Preferred stock warrants (Tables)
9 Months Ended
Sep. 30, 2021
Preferred stock warrant  
Preferred stock warrants  
Schedule of warrants to purchase the following classes of preferred stock outstanding

    

December 31, 2020

Series of

Preferred

redeemable

shares

Weighted

Contractual

convertible

issuable upon

average

term

preferred

Balance sheet

exercise

exercise

Warrant fair

Issuance date

    

(in years)

    

stock

    

classification

    

of warrant

    

price

    

value

April 24, 2017

 

10

 

Series A1

 

Liability

 

3,823,524

$

0.01

$

1,875

April 12, 2018

 

10

 

Series B1

 

Liability

 

1,199,994

$

0.01

 

1,501

May 14, 2020

 

10

 

Series C1

 

Liability

 

1,195,652

$

1.15

 

741

 

6,219,170

$

4,117