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CAPITAL STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 20, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Class of Warrant or Right [Line Items] |  |  |
Common stock, shares, issued (in shares) |  | 140,816,496 | 134,311,033
IPO |  |  |
Class of Warrant or Right [Line Items] |  |  |
Common stock, shares, issued (in shares) | 11,300,000 |  |
Price per share (in USD per share) | $ 1.47 |  |
Sale of stock, consideration received | $ 15,140 |  |
At The Market Sale Of Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Sale of stock, consideration received |  | $ 29,910 |
Sale of stock, number of shares issued (in shares) |  | 5,530,000 |
September 20, 2021 Expiration Date | Share Purchase Warrants Denominated in United States Dollars |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price of warrants (in dollars per share) |  | $ 2.45 |
Number of warrants outstanding (in shares) |  | 3,975,425 |

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