Annual report pursuant to section 13 and 15(d)

Total Number of Shares under Warrants to Purchase Common Stock (Detail)

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Total Number of Shares under Warrants to Purchase Common Stock (Detail)
Dec. 31, 2012
Stock Repurchase Program [Line Items]  
Total Shares Subject to Warrants 485,953
Kingstone Warrants
 
Stock Repurchase Program [Line Items]  
Total Shares Subject to Warrants 289,187
2009 Promissory Notes Warrants
 
Stock Repurchase Program [Line Items]  
Total Shares Subject to Warrants 196,766