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

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.

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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.

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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.

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Amount of investment in marketable security, classified as noncurrent.

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