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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of warrant activity
The following table provides a summary of warrant activity as of December 31, 2019 and 2018:
 
Warrants
 
Weighted-
Average
Exercise
Price
Outstanding at Outstanding at January 1, 2018
11,882,800

 
$
3.34

Exercised
(3,975,957
)
 
2.21

Forfeited or expired
(2,889,514
)
 
3.35
Outstanding at Outstanding at January 1, 2019
5,017,329

 
3.83
Forfeited or expired
(2,263,267
)
 
2.81
Outstanding at December 31, 2019
2,754,062

 
$
4.67


The outstanding warrants at December 31, 2019 will expire as follows:
Year
Warrants
2020
174,642

2021
—

2022
2,579,420

 
2,754,062