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FAIR VALUE ACCOUNTING (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | As of December 31, 2020 and 2019, 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.
December 31, 2020 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Investments accounted for at fair value | $ | 779 |  |  | $ | — |  |  | $ | — |  |  | $ | 779 |
Marketable equity securities (Note 4) | 2,247 |  |  | — |  |  | — |  |  | 2,247 |
Warrant liabilities (Note 12) | (8,573) |  |  | — |  |  | — |  |  | (8,573) |
| $ | (5,547) |  |  | $ | — |  |  | $ | — |  |  | $ | (5,547) |
December 31, 2019 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Investments accounted for at fair value | $ | 654 |  |  | $ | — |  |  | $ | — |  |  | $ | 654 |
Marketable equity securities (Note 4) | 630 |  |  | — |  |  | — |  |  | 630 |
Marketable debt securities (Note 4) | — |  |  | 4,208 |  |  | — |  |  | 4,208 |
Warrant liabilities (Note 12) | (2,791) |  |  | — |  |  | — |  |  | (2,791) |
Convertible Debentures (Note 11) | (16,382) |  |  | — |  |  | — |  |  | (16,382) |
| $ | (17,889) |  |  | $ | 4,208 |  |  | $ | — |  |  | $ | (13,681) |

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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://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=117815213&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 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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