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FAIR VALUE ACCOUNTING (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | The following tables set forth the fair value of the Company's assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy as at December 31, 2017. As required by accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. As at December 31, 2017, the fair values of cash and cash equivalents, restricted cash, short-term deposits, receivables, accounts payable and accrued liabilities approximate their carrying values because of the short-term nature of these instruments.
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Investments | $ | 1,937 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,937 |
Warrant liabilities (Note 13) | (2,991 | ) |  | (385 | ) |  | — |  |  | (3,376 | )
Convertible debentures (Note 12) | (16,636 | ) |  | — |  |  | — |  |  | (16,636 | )
| $ | (17,690 | ) |  | $ | (385 | ) |  | $ | — |  |  | $ | (18,075 | )
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques | The following table sets forth a summary of the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company's non-recurring Level 3 fair value measurements for the year ended December 31, 2017 and 2016.
| Date of Fair Value Measurement |  | Valuation Technique |  | Unobservable Input |  | Range/Weighted Average
| For the years ended December 31, 2017 and 2016
Nichols Ranch Project and mineral properties in the ISR and Conventional segments | December 31, 2015 |  | Discounted Cash Flow Model |  | Discount Rate |  | 10 | %
|  | Short and Long Term Uranium Price |  | $38.90 to $62.10 |
|  | United States Inflation Rate |  | 2 | %
Nichols Ranch Project | June 18, 2015 |  | Discounted Cash Flow Model |  | Discount Rate |  | 10 | %
|  | Short and Long Term Uranium Price |  | $37.95 to $65.00 |
|  | United States Inflation Rate |  | 2 | %
Acquired Uranerz exploration properties | June 18, 2015 and December 31, 2015 |  | Enterprise value to resource model and acreage multiple |  | Precedent Transaction Research |  | Measured and Indicated pounds U3O8 - 2.00x |
|  |  | Inferred Pounds U3O8 - 1.5x $77.0x - Acre |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are 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. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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