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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
(thousands of dollars) |  | 2021 |  | 2020
Cash and cash equivalents | ​ | $ | 115,293 | ​ | $ | 50,315
Restricted cash | ​ |  | — | ​ |  | 10
Cash, cash equivalents and restricted cash shown in the statement of cash flows | ​ | $ | 115,293 | ​ | $ | 50,325
Schedule of Fair Value on Recurring and Non-recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
(thousands of dollars) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Non-current Assets |  |  |  | ​ |  |  | ​ |  |  | ​ |  |
Land grant | ​ | $ | — | ​ | $ | — | ​ |  | 1,378 | ​ | $ | 1,378
Total non-current assets recorded at fair value | ​ | $ | — | ​ | $ | — | ​ | $ | 1,378 | ​ | $ | 1,378
Non-current Liabilities |  |  |  | ​ |  |  | ​ |  |  | ​ |  |
Land grant obligation | ​ | $ | — | ​ | $ | — | ​ |  | (1,378) | ​ | $ | (1,378)
Total non-current liabilities recorded at fair value | ​ | $ | — | ​ | $ | — | ​ | $ | (1,378) | ​ | $ | (1,378)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
(thousands of dollars) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Current Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Equity securities | ​ | $ | — | ​ | $ | — | ​ | $ | 1,520 | ​ | $ | 1,520
Total current assets recorded at fair value | ​ | $ | — | ​ | $ | — | ​ | $ | 1,520 | ​ | $ | 1,520
Non-current Assets | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Restricted cash | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | 10
Total non-current assets recorded at fair value | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | 10

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Schedule of Cash, Cash Equivalents and Restricted Cash [Table Text Block] + References No definition available. + Details
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