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STOCKHOLDERS' EQUITY - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 11, 2020 USD ($) $ / shares shares | Jul. 19, 2019 USD ($) trading_Days $ / shares shares | Dec. 31, 2018 shares | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2019 shares | Jan. 20, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 13,645,677 |  | 4,511,174 |
Shares issued, value | $ |  |  |  | $ 9,467,166 | $ 4,377,591 |  |
Expected life (years) |  |  |  | 4 years 9 months 21 days |  | 5 years 21 days | 5 years
Exercise price (in dollars per share) | $ / shares |  | $ 15.17 |  |  |  |  |
Number of shares called by warrants |  | 142,711 |  |  |  |  |
Offering costs | $ |  |  |  |  | 10,617 |  |
Consecutive trading days | trading_Days |  | 10 |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued, value | $ | $ 11,000,000.0 |  |  |  |  |  |
Shares issued | 1,252,173 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Conversion ratio |  | 25 |  |  |  |  |
Shares issued, value | $ |  |  |  | $ 835 | $ 96 |  |
Shares issued | 8,343,480 |  |  | 8,353,480 | 960,489 |  |
Number of rights per share |  | 1 |  |  |  |  |
Number of shares called by warrants | 9,599,999 |  |  |  |  |  |
Preferred shares converted to common shares (shares) |  |  |  | 777,825 |  |  |
Issuance of equity securities for license (shares) |  |  | 12,907 |  | 12,907 |  |
Common Stock | Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Expected life (years) | 5 years |  |  |  |  |  |
Number of rights per share | 1 |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 1.15 |  |  |  |  |  |
Common Stock | Flex Pharma |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Conversion ratio |  | 25 |  |  |  |  |
Common stock, shares outstanding |  | 8,353,480 |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued, value | $ |  |  |  | $ 125 |  |  |
Shares issued |  |  |  | 1,246,519 |  |  |
Preferred shares converted to common shares (shares) |  |  |  | (777,825) |  |  |
Class A | Common Stock | Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued | 7,101,307 |  |  |  |  |  |
Price per share (usd per share) | $ / shares | $ 1.15 |  |  |  |  |  |
Class B | Preferred Stock | Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares issued | 1,246,519 |  |  |  |  |  |
Price per share (usd per share) | $ / shares | $ 1.15 |  |  |  |  |  |
Series A Preferred | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  |  | 4,035 |  |
Preferred shares converted to common shares (shares) | 777,825 |  |  |  |  |  |
Series A Preferred | Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 1,246,519 |  |  |  |  |  |
Profit Interest Units | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  |  | 350 |  |
Common Units | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of equity securities for license (shares) |  |  | 91 |  |  |  |
Wedbush | Satisfy success fee |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Expected life (years) |  | 5 years |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  | $ 18.90 |  |  |  |  |
Number of shares called by warrants |  | 42,928 |  |  |  |  |
Warrant value | $ |  | $ 500,000 |  |  |  |  |
Due to related party | $ |  | 1,000,000 |  |  |  |  |
Cash payment to related party | $ |  | $ 500,000 |  |  |  |  |

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