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Securities Owned and Securities Sold, But Not Yet Purchased - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
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Jun. 30, 2014
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Dec. 31, 2013
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
$ 4,487
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$ 4,789
|
| Securities sold, but not yet purchased |
(353)
|
(83)
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Level 1
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
1,022
|
713
|
| Securities sold, but not yet purchased |
(54)
|
(33)
|
|
Level 2
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
3,465
|
4,076
|
| Securities sold, but not yet purchased |
(299)
|
(50)
|
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Level 3
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
0
|
0
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| Securities sold, but not yet purchased |
0
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0
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Debt securities
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
1,491
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1,402
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| Securities sold, but not yet purchased |
(99)
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(46)
|
|
Debt securities | Level 1
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
0
|
0
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| Securities sold, but not yet purchased |
0
|
0
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|
Debt securities | Level 2
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
1,491
|
1,402
|
| Securities sold, but not yet purchased |
(99)
|
(46)
|
|
Debt securities | Level 3
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
0
|
0
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| Securities sold, but not yet purchased |
0
|
0
|
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Certificates of deposit
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
3
|
24
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| Securities sold, but not yet purchased |
0
|
0
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Certificates of deposit | Level 1
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
3
|
24
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| Securities sold, but not yet purchased |
0
|
|
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Certificates of deposit | Level 2
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
0
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0
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| Securities sold, but not yet purchased |
0
|
|
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Certificates of deposit | Level 3
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
0
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0
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| Securities sold, but not yet purchased |
0
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U.S. Treasury notes
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
3
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1
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| Securities sold, but not yet purchased |
(200)
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0
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U.S. Treasury notes | Level 1
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
0
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0
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| Securities sold, but not yet purchased |
0
|
|
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U.S. Treasury notes | Level 2
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
3
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1
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| Securities sold, but not yet purchased |
(200)
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|
|
U.S. Treasury notes | Level 3
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
0
|
0
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| Securities sold, but not yet purchased |
0
|
|
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Common stock, restricted common stock and warrants
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,941
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1,414
|
| Securities sold, but not yet purchased |
(54)
|
(37)
|
|
Common stock, restricted common stock and warrants | Level 1
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
1,019
|
689
|
| Securities sold, but not yet purchased |
(54)
|
(33)
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|
Common stock, restricted common stock and warrants | Level 2
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
922
|
725
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| Securities sold, but not yet purchased |
0
|
(4)
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Common stock, restricted common stock and warrants | Level 3
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
0
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0
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| Securities sold, but not yet purchased |
0
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0
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Other investments
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
1,049
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1,948
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| Securities sold, but not yet purchased |
0
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0
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Other investments | Level 1
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
0
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0
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Other investments | Level 2
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities owned at fair value |
1,049
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1,948
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|
Other investments | Level 3
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|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
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| Securities owned at fair value |
$ 0
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$ 0
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