Securities Owned and Securities Sold, But Not Yet Purchased (Narrative) (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned deposited with the Company's subsidiaries clearing broker | $ 3,383 | $ 5,429 |
| Securities owned at fair value | 4,079 | 5,910 |
| Level 2 | ||
| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | 2,793 | 3,464 |
| Common Stock and Warrants | ||
| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | 927 | 1,981 |
| Common Stock and Warrants | Warrants to purchase common stock | Level 2 | ||
| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | $ 545 | $ 403 |
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- Definition Securities owned and held at clearing broker. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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