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WARRANTS - Warrants and Rights Outstanding, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jul. 31, 2018
Class of Warrant or Right, Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 1,104,560 |  |
Exercises during the period (in shares) | 1,150,956 | 0 |
Outstanding, end of period (in shares) | 0 | 1,104,560 |
October 2015/ March 2016 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants (in shares) | 2,103,930 |  |
Exercise price (in dollars per share) | $ 0.10 |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 717,225 | 717,225 |
Exercises during the period (in shares) | 717,225 | 0 |
Outstanding, end of period (in shares) | 0 | 717,225 |
Fair value of warrants or rights | $ 0 |  |
October 1, 2016 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants (in shares) | 157,580 |  |
Exercise price (in dollars per share) | $ 0.07 |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 157,580 | 157,580 |
Exercises during the period (in shares) | 157,580 | 0 |
Outstanding, end of period (in shares) | 0 | 157,580 |
Fair value of warrants or rights | $ 0 |  |
July 2018 |  |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 306,835 | 306,835 |
Exercises during the period (in shares) | 276,151 | 0 |
Outstanding, end of period (in shares) | 30,684 | 306,835 |
Fair value of warrants or rights | $ 15 |  |
July 2018 - Allotment 1 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants (in shares) | 122,735 |  | 122,735
Exercise price (in dollars per share) | $ 1.28 |  | $ 1.28
July 2018 - Allotment 2 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants (in shares) | 184,100 |  | 184,100
Exercise price (in dollars per share) | $ 1.28 |  | $ 1.28

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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