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STOCKHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Shares Reserved for Future Issuance
The following shares were reserved for future issuance:
 
December 31, 2018
Common stock options outstanding and available for future grant
5,574,901

Warrants to purchase common stock
11,817,912

Employee Stock Purchase Plan
157,360

 
17,550,173

Schedule of warrants issued and outstanding
As of December 31, 2018, the following warrants for common stock were issued and outstanding:
Issue date
 
Expiration date
 
Exercise price
 
Number of warrants outstanding
January 11, 2017
 
None
 
$
0.001

 
7,258,263

November 20, 2017
 
None
 
$
0.001

 
4,137,999

June 11, 2018
 
None
 
$
0.001

 
421,650

 
 
 
 
 
 
11,817,912