Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Restricted Stock Units (Details)

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STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Restricted Stock Units (Details) - Restricted stock units
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of shares  
Unvested balance at December 31, 2020 | shares 815,524
Restricted stock units forfeited | shares (107,000)
Unvested balance at September 30, 2021 | shares 708,524
Weighted average grant price  
Unvested balance at December 31, 2020 | $ / shares $ 3.37
Restricted stock units forfeited | $ / shares 3.37
Unvested balance at September 30, 2021 | $ / shares $ 3.37
Vesting period 5 years
Share based compensation expense | $ $ 0.0
Stock-based compensation expense contingent upon vesting event | $ $ 2.8