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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Compensating Balances [Line Items] |  |
Adjusted Cost | $ 86,029,000 | $ 11,524,000
Unrealized Gain/(Loss) | (3,525,000) | 3,851,000
Fair Value | 82,504,000 | 15,375,000
Cash and Cash Equivalents | 65,645,000 | 5,183,000
Current Marketable Securities | 7,319,000 | 9,136,000
Investments | 9,540,000 | 1,056,000
Fair Value, Inputs, Level 2 [Member] | Warrant [Member] |  |
Compensating Balances [Line Items] |  |
Adjusted Cost | 15,657,000 | 700,000
Unrealized Gain/(Loss) | (6,117,000) | 356,000
Fair Value | 9,540,000 | 1,056,000
Cash and Cash Equivalents |  |
Current Marketable Securities |  |
Investments | 9,540,000 | 1,056,000
Cash and Cash Equivalents [Member] |  |
Compensating Balances [Line Items] |  |
Adjusted Cost | 6,497,000 | 1,690,000
Unrealized Gain/(Loss) |  |
Fair Value | 6,497,000 | 1,690,000
Cash and Cash Equivalents | 6,497,000 | 1,690,000
Current Marketable Securities |  |
Investments |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Compensating Balances [Line Items] |  |
Adjusted Cost | 59,148,000 | 3,493,000
Unrealized Gain/(Loss) |  |
Fair Value | 59,148,000 | 3,493,000
Cash and Cash Equivalents | 59,148,000 | 3,493,000
Current Marketable Securities |  |
Investments |  |
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Compensating Balances [Line Items] |  |
Adjusted Cost | 4,727,000 | 5,641,000
Unrealized Gain/(Loss) | 2,592,000 | 3,495,000
Fair Value | 7,319,000 | 9,136,000
Cash and Cash Equivalents |  |
Current Marketable Securities | 7,319,000 | 9,136,000
Investments |  |
Cash Equivalents [Member] |  |
Compensating Balances [Line Items] |  |
Cash and Cash Equivalents | $ 65,645,000 | $ 5,183,000

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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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