Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Changes in Outstanding Options (Details)

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EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Changes in Outstanding Options (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Options  
Beginning Balance (in shares) | shares 5,010,576
Granted (in shares) | shares 3,426,355
Ending Balance (in shares) | shares 8,436,931
Weighted Average Strike Price  
Beginning Balance (in dollars per share) | $ / shares $ 2.55
Granted (in dollars per share) | $ / shares 5.44
Ending Balance (in dollars per share) | $ / shares $ 3.72
Weighted Average Life Remaining  
Exercisable, Number of Options (in shares) | shares 2,705,586
Exercisable, Weighted Average Strike Price (in shares) | $ / shares $ 2.64
Weighted Average Life Remaining (in years) 7 years 8 months 20 days
Weighted Average Life Remaining (in years), Exercisable 4 years 7 months 20 days