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The following table summarizes the changes in investments in debt and equity securities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the six months ended June 30, 2021: (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in fair value of warrants | $ (290,000) | $ 10,000 | $ 388,000 | $ 6,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Balance at January 1, 2021 |  |  | 262,000 |
Investment in convertible promissory notes |  |  | 1,136,000 |
Investment in convertible preferred stock |  |  | 600,000 |
Investment in warrants |  |  | 2,467,000 |
Change in fair value of warrants |  |  | 1,224,000 |
Accretion of discount |  |  | 980,000 |
Conversion to marketable securities |  |  | (2,656,000) |
Balance at June 30, 2021 | $ 4,013,000 |  | $ 4,013,000 |

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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