Annual report pursuant to section 13 and 15(d)

Common Stock Reserved for Issuance (Detail)

v2.4.0.6
Common Stock Reserved for Issuance (Detail)
 12 Months Ended
Dec. 31, 2012
Components of Common Stock Reserved [Line Items]  
Employee stock options 1,087,973
Base Warrant
  
Components of Common Stock Reserved [Line Items]  
Common Stock Reserved for Issuance 485,953
Series B Preferred Stock
  
Components of Common Stock Reserved [Line Items]  
Common Stock Reserved for Issuance 153
Series C Preferred Stock
  
Components of Common Stock Reserved [Line Items]  
Common Stock Reserved for Issuance 14,515,895
Series C Preferred Stock | Other Accrued Liabilities
  
Components of Common Stock Reserved [Line Items]  
Common Stock Reserved for Issuance 44,354
Series D Preferred Stock
  
Components of Common Stock Reserved [Line Items]  
Common Stock Reserved for Issuance 1,712,171