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Senior Convertible Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands	Aug. 18, 2010 USD ($) d $ / shares	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Senior convertible notes due August 15, 2015
Debt Instrument [Line Items]
Principal amount	$ 100,000	$ 100,000	$ 100,000
Accrued interest payable		$ 2,400	$ 2,400
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%
Percentage of conversion price equaling stock price	150.00%
Number of trading days | d	20
Consecutive trading days	30 days
Debt Issuance Cost	$ 4,200
Senior notes, effective interest rate		5.75%
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%

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