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Securities Owned and Securities Sold, But Not Yet Purchased (Securities Are Recorded At Fair Value) (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2012
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Dec. 31, 2011
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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 |
$ 2,078
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$ 2,014
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| Securities sold, but not yet purchased, at fair value |
292
|
78
|
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Fair Value, Inputs, Level 1 [Member]
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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 |
398
|
191
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| Securities sold, but not yet purchased, at fair value |
70
|
68
|
|
Fair Value, Inputs, Level 2 [Member]
|
|
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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 |
1,680
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1,823
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| Securities sold, but not yet purchased, at fair value |
222
|
10
|
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Fair Value, Inputs, Level 3 [Member]
|
|
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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, at fair value |
0
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0
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Common Stock and Warrants [Member]
|
|
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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 |
384
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191
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| Securities sold, but not yet purchased, at fair value |
70
|
78
|
|
Common Stock and Warrants [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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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 |
384
|
191
|
| Securities sold, but not yet purchased, at fair value |
70
|
68
|
|
Common Stock and Warrants [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
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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 |
582
|
1,823
|
| Securities sold, but not yet purchased, at fair value |
0
|
10
|
|
Common Stock and Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
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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, at fair value |
0
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0
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Restricted common stock and warrants
|
|
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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 |
582
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1,823
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| Securities sold, but not yet purchased, at fair value |
0
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0
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Us Treasury Notes Securities [Member]
|
|
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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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| Securities sold, but not yet purchased, at fair value |
99
|
|
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Us Treasury Notes Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities sold, but not yet purchased, at fair value |
0
|
|
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Us Treasury Notes Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities sold, but not yet purchased, at fair value |
99
|
|
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Us Treasury Notes Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
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| Securities sold, but not yet purchased, at fair value |
0
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|
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Certificates Of Deposit [Member]
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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 |
14
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| Securities sold, but not yet purchased, at fair value |
0
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Certificates Of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
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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 |
14
|
|
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Certificates Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
|
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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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Certificates Of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
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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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Debt Securities [Member]
|
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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 |
1,098
|
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| Securities sold, but not yet purchased, at fair value |
123
|
|
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Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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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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| Securities sold, but not yet purchased, at fair value |
0
|
|
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Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
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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 |
1,098
|
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| Securities sold, but not yet purchased, at fair value |
123
|
|
|
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
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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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| Securities sold, but not yet purchased, at fair value |
$ 0
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