Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Unvested restricted stock outstanding (Details)

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STOCKHOLDERS' EQUITY - Unvested restricted stock outstanding (Details)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
STOCKHOLDERS' EQUITY  
Balance outstanding at the beginning of the period (in shares) | shares 2,870,000
Forteited (in shares) | shares (56,000)
Vested (in shares) | shares (851,000)
Granted (in shares) | shares 778,000
Balance outstanding at the end of the period (in shares) | shares 2,741,000
Balance at the beginning of the period (in dollars per share) | $ / shares $ 20.36
Forfeited (in dollars per share) | $ / shares 24.80
Vested (in dollars per share) | $ / shares 16.62
Granted (in dollars per share) | $ / shares 37.04
Balance at the end of the period (in dollars per share) | $ / shares $ 26.16