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Senior Convertible Notes - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 10, 2015
USD ($)
d
$ / shares
shares
Jul. 28, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Deerfield          
Debt Instrument [Line Items]          
Premium of issuance of 2018 debt     $ 419 $ 364  
2018 Notes          
Debt Instrument [Line Items]          
Accretion of debt issuance costs     62,000    
Senior convertible notes due August 15, 2018          
Debt Instrument [Line Items]          
Principal amount $ 27,700   27,690   $ 27,690
Senior notes, effective interest rate 5.75%        
Unamortized premium $ 700   $ 603   $ 660
Maturity date     Aug. 15, 2018    
No of convertible shares 147.0859        
Principal amount per share | $ / shares $ 1,000        
Conversion price of shares | $ / shares $ 6.80        
Percentage of repurchase price 100.00%        
Debt Instrument, redemption description     On or after the date that is one year following the original issue date of the 2018 notes, the Company will have the right to redeem for cash all or part of the 2018 notes if the last reported sale price of its common stock exceeds 130% of the conversion price then in effect for 20 or more trading days during the 30 consecutive trading day period ending on the trading day immediately prior to the date of the redemption notice. The redemption price will equal the sum of 100% of the principal amount of the 2018 notes to be redeemed, plus accrued and unpaid interest.    
Percentage of conversion price equaling stock price 130.00%        
Number of trading days | d 20        
Consecutive trading days 30 days        
Debt Issuance Cost   $ 800      
Premium of issuance of 2018 debt     $ 57,000    
Senior convertible notes due August 15, 2018 | If certain fundamental changes occur          
Debt Instrument [Line Items]          
Conversion price of shares | $ / shares $ 6.80        
Number of shares to be converted | shares 741,100        
Senior convertible notes due August 15, 2018 | Minimum | If certain fundamental changes occur          
Debt Instrument [Line Items]          
Share price on date of conversion | $ / shares $ 4.82        
Senior convertible notes due December 31, 2019 | Deerfield          
Debt Instrument [Line Items]          
Principal amount     $ 60,000    
Senior notes, effective interest rate     9.75%    
Senior convertible notes due December 31, 2019 | Deerfield | Less portion of commitment asset          
Debt Instrument [Line Items]          
Principal amount     $ 20,000    
Senior notes, effective interest rate     8.75%