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Securities Owned/Sold but Not Yet Purchased (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Securities Owned/Sold But Not Yet Purchased | These securities consist of securities classified as trading and available-for-sale, as follows:
|  | September 30, 2018 |  |  | December 31, 2017 |
Securities Owned |  |  |  |  |  |  |  |
Trading securities |  | $ | 4,426 |  |  | $ | 1,691 |
Available-for-sale debt securities |  |  | — |  |  |  | 64,603 |
Total |  | $ | 4,426 |  |  | $ | 66,294 |
Securities Sold, but not yet Purchased |  |  |  |  |  |  |  |
Trading securities |  | $ | 2,018 |  |  | $ | 950 |
Available-for-sale debt securities |  |  | — |  |  |  | — |
Total |  | $ | 2,018 |  |  | $ | 950 |
Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities | The following table summarizes unrealized gains, losses and fair value of the available-for-sale debt securities:
|  | September 30, 2018 |  |  | December 31, 2017 |
Cost |  | $ | — |  |  | $ | 65,237 |
Gross unrealized gains in other comprehensive income |  |  | — |  |  |  | — |
Gross unrealized losses in other comprehensive income |  |  | — |  |  |  | (634 | )
Fair value |  | $ | — |  |  | $ | 64,603 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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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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