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Subsequent Event - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
6 Months Ended 268 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jul. 01, 2013
Subsequent Event
Deerfield
Tranche
Jul. 01, 2013
Subsequent Event
Deerfield
Maximum
Jul. 01, 2013
Subsequent Event
Deerfield
Notes 9.75% Due in 2019
Jul. 01, 2013
Subsequent Event
Deerfield
Notes 9.75% Due in 2019
Maximum
Jul. 01, 2013
Subsequent Event
Deerfield
Conversion price exceeds $6.67
Jul. 01, 2013
Subsequent Event
Deerfield
Conversion price exceeds $6.67
Maximum
Jul. 01, 2013
Subsequent Event
Deerfield
Conversion price is less than $3.33
Jul. 01, 2013
Subsequent Event
Deerfield
Conversion price is less than $3.33
Maximum
Jul. 01, 2013
Subsequent Event
Deerfield
Conversion price between $3.33 and 6.67
Maximum
Subsequent Event [Line Items]                      
Senior secured notes     $ 160,000,000                
Number of ranches of debt financing     4                
Payment in each tranches     40,000,000                
Discount of debt issuance         21,100,000            
Repayment of outstanding principal amount         25.00%            
Senior convertible notes, interest rate         9.75%            
Senior convertible notes, maturity date Jan. 01, 2014       Dec. 31, 2019            
Conversion trading days     20 days                
Conversion price of shares             $ 6.67   $ 3.33    
Shares issuable upon conversion               6   12  
Shares issuable upon conversion, value   3,331,000                 40,000,000
Payment related to milestone right       90,000,000              
Milestone agreement payment           $ 18,900,000