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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost | $ 62,922,000 | $ 73,929,000
Adjusted Cost | 67,285,000 | 73,929,000
Unrealized Gain/(Loss) | 3,042,000 | 1,544,000
Fair Value | 70,327,000 | 75,473,000
Cash and Cash Equivalents | 43,945,000 | 56,595,000
Restricted cash |  |
Marketable Securities | 17,224,000 | 14,537,000
Notes receivable |  |
Investments | 9,158,000 | 4,341,000
Fair Value, Inputs, Level 2 [Member] | Convertible Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost |  | 1,023,000
Adjusted Cost | 1,023,000 | 1,023,000
Unrealized Gain/(Loss) | 1,135,000 |
Fair Value | 2,158,000 | 1,023,000
Cash and Cash Equivalents |  |
Restricted cash |  |
Marketable Securities |  |
Notes receivable |  |
Investments | 2,158,000 | 1,023,000
Fair Value, Inputs, Level 2 [Member] | Warrant [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost |  | 3,318,000
Adjusted Cost | 3,318,000 | 3,318,000
Unrealized Gain/(Loss) | 3,682,000 |
Fair Value | 7,000,000 | 3,318,000
Cash and Cash Equivalents |  |
Restricted cash |  |
Marketable Securities |  |
Notes receivable |  |
Investments | 7,000,000 | 3,318,000
Cash [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost | 40,811,000 | 50,286,000
Adjusted Cost | 40,811,000 | 50,286,000
Unrealized Gain/(Loss) |  |
Fair Value | 40,811,000 | 50,286,000
Cash and Cash Equivalents | 40,811,000 | 50,286,000
Restricted cash |  |
Marketable Securities |  |
Notes receivable |  |
Investments |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost | 3,134,000 | 6,309,000
Adjusted Cost | 3,134,000 | 6,309,000
Unrealized Gain/(Loss) |  |
Fair Value | 3,134,000 | 6,309,000
Cash and Cash Equivalents | 3,134,000 | 6,309,000
Restricted cash |  |
Marketable Securities |  |
Notes receivable |  |
Investments |  |
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Adjusted Cost | 18,977,000 | 12,993,000
Adjusted Cost | 18,999,000 | 12,993,000
Unrealized Gain/(Loss) | (1,775,000) | 1,544,000
Fair Value | 17,224,000 | 14,537,000
Cash and Cash Equivalents |  |
Restricted cash |  |
Marketable Securities | 17,224,000 | 14,537,000
Notes receivable |  |
Investments |  |

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