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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value | The following tables present the Company's fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of the periods presented.
|  | As of September 30, 2021
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities* |  | $ | 2,990,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,990,000 |
Certificates of deposit |  |  | — |  |  |  | 92,000 |  |  |  | — |  |  |  | 92,000 |
Corporate bonds |  |  | — |  |  |  | 38,000 |  |  |  | — |  |  |  | 38,000 |
Equity securities |  |  | 648,000 |  |  |  | 248,000 |  |  |  | — |  |  |  | 896,000 |
Total Securities owned, at fair value |  | $ | 3,638,000 |  |  | $ | 378,000 |  |  | $ | — |  |  | $ | 4,016,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | — |  |  | $ | 27,000 |  |  | $ | — |  |  | $ | 27,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | — |  |  | $ | 27,000 |  |  | $ | — |  |  | $ | 27,000 |
|  | As of December 31, 2020
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities* |  | $ | 2,029,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,029,000 |
Certificates of deposit |  |  | — |  |  |  | 91,000 |  |  |  | — |  |  |  | 91,000 |
Corporate bonds |  |  | — |  |  |  | 24,000 |  |  |  | — |  |  |  | 24,000 |
Equity securities |  |  | 345,000 |  |  |  | 134,000 |  |  |  | — |  |  |  | 479,000 |
Total Securities owned, at fair value |  | $ | 2,374,000 |  |  | $ | 249,000 |  |  | $ | — |  |  | $ | 2,623,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | — |  |  | $ | 21,000 |  |  | $ | — |  |  | $ | 21,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | — |  |  | $ | 21,000 |  |  | $ | — |  |  | $ | 21,000 |
*As of September 30, 2021 and December 31, 2020, the U.S. government securities had maturity dates of August 15, 2024 and August 31, 2021, respectively.

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- Definition Tabular disclosure of financial instruments held by a broker-dealer for its own account (proprietary securities) for trading or investment purposes that are carried at fair value including securities sold, not yet purchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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