Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY AND LOSS PER SHARE (Tables)

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STOCKHOLDERS' EQUITY AND LOSS PER SHARE (Tables)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table presents the number of shares excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods below:
Nine Months Ended September 30,
  2021 2020
Common stock options 958,356  1,152,552 
Non-vested restricted stock unit awards 4,455,994  3,552,143 
Total shares excluded from net loss per share attributable to common stockholders 5,414,350  4,704,695