Quarterly report pursuant to sections 13 or 15(d)

Securities Owned and Securities Sold, But Not Yet Purchased, at Fair Value (Detail)

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Securities Owned and Securities Sold, But Not Yet Purchased, at Fair Value (Detail) (USD $)
In Thousands
Jun. 30, 2012
Dec. 31, 2011
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
Common stock and warrants
   
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
   
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Securities owned $ 1,008 $ 1,823