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4. BASIC AND DILUTED LOSS PER SHARE (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of potential common stock equivalents not included in the calculation of diluted net loss per common share
   Three Months Ended March 31 
   2018   2017 
Stock Options   2,476    2,107 
Unvested restricted stock   316    518 
Warrants   765    765 
    3,557    3,390