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EQUITY INCENTIVE PLAN (Summary of Stock Option Activity) (Details)
 9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Options  
Outstanding at beginning of period (in shares) | shares 236,484
Granted (in shares) | shares 3,365,488
Forfeited (in shares) | shares (202,896)
Outstanding at end of period (in shares) | shares 3,399,076
Exercisable at end of period (in shares) | shares 260,201
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 7.12
Granted (in dollars per share) | $ / shares 0.70
Forfeited (in dollars per share) | $ / shares 2.16
Outstanding at end of period (in dollars per share) | $ / shares 1.06
Exercisable at end of period (in dollars per share) | $ / shares $ 4.66