|
Securities Owned and Securities Sold, But Not Yet Purchased - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2013
|
Dec. 31, 2012
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
$ 3,834
|
$ 2,078
|
| Securities sold, but not yet purchased |
333
|
292
|
|
Debt securities
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,666
|
1,098
|
| Securities sold, but not yet purchased |
15
|
123
|
|
Certificates of deposit
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
|
14
|
| Securities sold, but not yet purchased |
|
0
|
|
U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
5
|
0
|
| Securities sold, but not yet purchased |
198
|
99
|
|
Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,555
|
384
|
| Securities sold, but not yet purchased |
120
|
70
|
|
Fair value disclosure
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,834
|
2,078
|
| Securities sold, but not yet purchased |
(333)
|
(292)
|
|
Fair value disclosure | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,555
|
398
|
| Securities sold, but not yet purchased |
(120)
|
(70)
|
|
Fair value disclosure | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
2,279
|
1,680
|
| Securities sold, but not yet purchased |
(213)
|
(222)
|
|
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 |
1,666
|
1,098
|
| Securities sold, but not yet purchased |
(15)
|
(123)
|
|
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 |
1,666
|
1,098
|
| Securities sold, but not yet purchased |
(15)
|
(123)
|
|
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 |
|
14
|
|
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 |
|
14
|
|
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
|
|
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
|
|
Fair value disclosure | U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
5
|
|
| Securities sold, but not yet purchased |
(198)
|
(99)
|
|
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
|
|
| Securities sold, but not yet purchased |
0
|
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 |
5
|
|
| Securities sold, but not yet purchased |
(198)
|
(99)
|
|
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
|
|
| Securities sold, but not yet purchased |
0
|
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 |
2,163
|
966
|
| Securities sold, but not yet purchased |
(120)
|
(70)
|
|
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 |
1,555
|
384
|
| Securities sold, but not yet purchased |
(120)
|
(70)
|
|
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 |
608
|
582
|
| Securities sold, but not yet purchased |
0
|
0
|
|
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
|