Quarterly report pursuant to Section 13 or 15(d)

Securities Owned and Securities Sold, But Not Yet Purchased - Narrative (Details)

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Securities Owned and Securities Sold, But Not Yet Purchased - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities owned deposited with the Company's subsidiaries clearing broker $ 4,003   $ 5,429
Securities owned, at fair value 4,617 $ 4,617 5,910
Common stock and warrants      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities owned, at fair value 966   1,981
Level 2      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities owned, at fair value 3,198   3,464
Level 2 | Common stock and warrants | Warrants to purchase common stock      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities owned, at fair value $ 440   $ 403