v2.4.0.6
Debt (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Line of Credit Facility [Line Items]      
Maximum borrowing capacity of term loan $ 20,000,000    
Term loan funded at closing 10,000,000    
Term loan bearing interest rate per annum 9.25%    
Sum of the prevailing prime rate minus 4.50%    
Proceeds from issuance of debt 9,726,000 0  
Issuance costs 300,000    
Deferred financing costs, net 100,000   0
Payment terms The Loan and Security Agreement is repayable in installments over forty-two months including an initial interest-only period of twelve months after closing. The interest only period is extendable to December 31, 2013, contingent upon completion of certain ARIKACE-related development milestones.    
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding (in shares) 300,000 200,000  
Components of the Company's debt [Abstract]      
Loan and Security Agreement 10,000,000    
End of term charge 21,000    
Less:      
Unamortized issuance costs (220,000)    
Unamortized discount from warrant (706,000)    
Debt, current (592,000)   0
Long-term debt 8,503,000   0
Warrant [Member]
      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding (in shares) 329,932    
Investment Warrants, Exercise Price (in dollars per share) $ 2.94    
Warrants exercisable period 5 years    
Fair value of warrants 800,000    
Insmed Option [Member]
      
Line of Credit Facility [Line Items]      
Term loan funded at closing 10,000,000    
Components of the Company's debt [Abstract]      
Loan and Security Agreement $ 10,000,000