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Securities Owned and Securities Sold, But Not Yet Purchased, at Fair Value (Detail) (USD $)
In Thousands |
Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] | ||
| Securities owned | $ 1,336 | $ 2,014 |
| Securities sold, but not yet purchased | 64 | 78 |
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Common stock and warrants
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] | ||
| Securities owned | 328 | 191 |
| Securities sold, but not yet purchased | 64 | 78 |
|
Restricted common stock and warrants
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| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] | ||
| Securities owned | $ 1,008 | $ 1,823 |