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WARRANTS (Tables)
 3 Months Ended
Mar. 31, 2022
Warrants and Rights Note Disclosure [Abstract]  
Warrants and Rights Outstanding, Activity
The following tables are summaries of the terms of the warrants and warrant activity as well as warrants outstanding at March 31, 2022:
Date of issuanceOctober 2015/ March 2016October 2016July 2018 - Allotment 1July 2018 - Allotment 2
Number of warrants2,103,930 157,580 122,735 184,100 
Exercise Price$0.10 $0.07 $1.28 $1.28 
StatusVestedVestedVestedVested
ExpirationOctober 2024October 2026July 2028July 2028
Date of issuanceOctober 2015/ March 2016October 2016July 2018
Outstanding at December 31, 2020717,225 157,580 306,835 
Exercised during the three months ended March 31, 2021— — — 
Outstanding at March 31, 2021717,225 157,580 306,835 
Outstanding at December 31, 2021— — 30,684 
Exercised during the three months ended March 31, 2022— — 25,570 
Outstanding at March 31, 2022— — 5,114 
Fair value at March 31, 2022 (in thousands)$— $— $3