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LOSS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Potentially Dilutive Securities
The following potentially dilutive securities outstanding as of December 31, 2020, 2019 and 2018 have been excluded from the denominator of the diluted loss per share of common stock outstanding calculation (in thousands):
December 31,
 202020192018
Warrants2,247 22,895 9,258 
Stock options10,147 6,236 3,942 
12,394 29,131 13,200