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Securities Owned and Securities Sold, But Not Yet Purchased - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2013
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Dec. 31, 2012
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
$ 3,066
|
$ 2,078
|
| Securities sold, but not yet purchased |
306
|
292
|
|
Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
174
|
70
|
|
Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
132
|
222
|
|
Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Debt securities
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,474
|
1,098
|
| Securities sold, but not yet purchased |
31
|
123
|
|
Debt securities | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Debt securities | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
31
|
123
|
|
Debt securities | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Certificates of deposit
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
6
|
14
|
| Securities sold, but not yet purchased |
0
|
0
|
|
U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
10
|
0
|
| Securities sold, but not yet purchased |
101
|
99
|
|
U.S. Treasury notes | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
U.S. Treasury notes | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
101
|
99
|
|
U.S. Treasury notes | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
737
|
384
|
| Securities sold, but not yet purchased |
174
|
70
|
|
Common stock and warrants | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
174
|
70
|
|
Common stock and warrants | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
0
|
0
|
|
Common stock and warrants | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| 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 |
3,066
|
2,078
|
|
Fair value disclosure | Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
743
|
398
|
|
Fair value disclosure | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
2,323
|
1,680
|
|
Fair value disclosure | Level 3
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
0
|
0
|
|
Fair value disclosure | Debt securities
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,474
|
1,098
|
|
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
|
|
Fair value disclosure | Debt securities | Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,474
|
1,098
|
|
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
|
|
Fair value disclosure | Certificates of deposit
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
6
|
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 |
6
|
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
|
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
|
|
Fair value disclosure | U.S. Treasury notes
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
10
|
|
|
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
|
|
|
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 |
10
|
|
|
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
|
|
|
Fair value disclosure | Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,576
|
966
|
|
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 |
737
|
384
|
|
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 |
839
|
582
|
|
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
|