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Financial Instruments - Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Adjusted Cost | $ 60,530,000 | $ 11,567,000
Unrealized Gain/(Loss) | 2,787,000 | 3,851,000
Fair Value | 63,317,000 | 15,418,000
Cash and Cash Equivalents | 52,061,000 | 5,226,000
Current Marketable Securities | 10,085,000 | 9,136,000
Investments | 1,171,000 | 1,056,000
Level 2 [Member] | Warrant [Member] |  |
Adjusted Cost | 700,000 | 700,000
Unrealized Gain/(Loss) | 471,000 | 356,000
Fair Value | 1,171,000 | 1,056,000
Cash and Cash Equivalents |  |
Current Marketable Securities |  |
Investments | 1,171,000 | 1,056,000
Cash and Cash Equivalents [Member] |  |
Adjusted Cost | 20,140,000 | 1,733,000
Unrealized Gain/(Loss) |  |
Fair Value | 20,140,000 | 1,733,000
Cash and Cash Equivalents | 20,140,000 | 1,733,000
Current Marketable Securities |  |
Investments |  |
Money Market Funds [Member] | Level 1 [Member] |  |
Adjusted Cost | 31,921,000 | 3,493,000
Unrealized Gain/(Loss) |  |
Fair Value | 31,921,000 | 3,493,000
Cash and Cash Equivalents | 31,921,000 | 3,493,000
Current Marketable Securities |  |
Investments |  |
Marketable Securities [Member] | Level 1 [Member] |  |
Adjusted Cost | 7,769,000 | 5,641,000
Unrealized Gain/(Loss) | 2,316,000 | 3,495,000
Fair Value | 10,085,000 | 9,136,000
Cash and Cash Equivalents |  |
Current Marketable Securities | $ 10,085,000 | 9,136,000
Investments |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI http://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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