|
Securities Owned and Securities Sold, But Not Yet Purchased - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2014
|
Dec. 31, 2013
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
$ 6,717
|
$ 4,789
|
| Securities sold, but not yet purchased |
(6,010)
|
(83)
|
|
Debt securities
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,257
|
1,402
|
| Securities sold, but not yet purchased |
(15)
|
(46)
|
|
Certificates of deposit
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
113
|
24
|
| Securities sold, but not yet purchased |
(21)
|
0
|
|
U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
4
|
1
|
| Securities sold, but not yet purchased |
(50)
|
0
|
|
Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,195
|
689
|
| Securities sold, but not yet purchased |
(5,924)
|
(33)
|
|
Other investments
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,286
|
1,948
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Fair value disclosure
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
6,717
|
4,789
|
| Securities sold, but not yet purchased |
(6,010)
|
(83)
|
|
Fair value disclosure | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,308
|
713
|
| Securities sold, but not yet purchased |
(5,945)
|
(33)
|
|
Fair value disclosure | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,409
|
4,076
|
| Securities sold, but not yet purchased |
(65)
|
(50)
|
|
Fair value disclosure | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Fair value disclosure | Debt securities
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,257
|
1,402
|
| Securities sold, but not yet purchased |
(15)
|
(46)
|
|
Fair value disclosure | Debt securities | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Fair value disclosure | Debt securities | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,257
|
1,402
|
| Securities sold, but not yet purchased |
(15)
|
(46)
|
|
Fair value disclosure | Debt securities | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Fair value disclosure | Certificates of deposit
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
113
|
24
|
| Securities sold, but not yet purchased |
(21)
|
|
|
Fair value disclosure | Certificates of deposit | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
113
|
24
|
| Securities sold, but not yet purchased |
(21)
|
|
|
Fair value disclosure | Certificates of deposit | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
|
|
Fair value disclosure | Certificates of deposit | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
|
|
Fair value disclosure | U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
4
|
1
|
| Securities sold, but not yet purchased |
(50)
|
|
|
Fair value disclosure | U.S. Treasury notes | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
|
|
Fair value disclosure | U.S. Treasury notes | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
4
|
1
|
| Securities sold, but not yet purchased |
(50)
|
|
|
Fair value disclosure | U.S. Treasury notes | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
|
|
Fair value disclosure | Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
4,057
|
1,414
|
| Securities sold, but not yet purchased |
(5,924)
|
(37)
|
|
Fair value disclosure | Common stock and warrants | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,195
|
689
|
| Securities sold, but not yet purchased |
(5,924)
|
(33)
|
|
Fair value disclosure | Common stock and warrants | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
862
|
725
|
| Securities sold, but not yet purchased |
0
|
(4)
|
|
Fair value disclosure | Common stock and warrants | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Fair value disclosure | Other investments
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,286
|
1,948
|
|
Fair value disclosure | Other investments | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
|
Fair value disclosure | Other investments | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,286
|
1,948
|
|
Fair value disclosure | Other investments | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
$ 0
|
$ 0
|