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Securities Owned and Securities Sold, But Not Yet Purchased - Narrative (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned deposited with the Company's subsidiaries clearing broker | $ 6,034 | $ 4,014 |
| Securities owned at fair value | 6,717 | 4,789 |
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Common stock and warrants
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | 3,195 | 689 |
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Level 2 | Common stock and warrants | Warrants to purchase common stock
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| Schedule of Trading Securities and Other Trading Assets [Line Items] | ||
| Securities owned at fair value | $ 530 | $ 534 |