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CAPITAL STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 14, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Sep. 20, 2016
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of warrants issued (in shares) |  |  |  |  | 2,328,925 |
Nichols Ranch, Hank and Doughstick Properties |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued for acquisition (in shares) | 1,100,000 |  |  |  |  |
Total purchase price | $ 3,740 |  |  |  |  |
At The Market Sale Of Stock |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 8,043,365 | 14,283,254 | 7,202,479 |  |
Sale of stock consideration received |  | $ 19,680 | $ 31,520 | $ 14,150 |  |
Public Offerings |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 3,199,866 | 7,576,288 | 3,822,561 |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 2.45

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