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Senior Convertible Notes - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 10, 2015 d $ / shares shares | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jul. 28, 2015 USD ($)
Deerfield |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of notes premium | $ |  | $ 428,000 | $ 397,000 | $ 1,280,000 | $ 1,142,000 |
5.75% Senior convertible notes due August 15, 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date | Aug. 15, 2018 |  |  |  |  |
Senior notes, effective interest rate | 5.75% |  |  |  |  |
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 | $ |  |  |  |  |  | $ 800,000
Amortization of notes premium | $ |  | 59,000,000 | 29,000,000 | $ 174,000,000 | 29,000,000 |
Accretion of debt issuance costs | $ |  | $ 65,000,000 | $ 0 | $ 190,000,000 | $ 0 |
5.75% 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 | 747,100 |  |  |  |  |
5.75% 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] |  |  |  |  |  |
Senior notes, effective interest rate |  | 9.75% |  | 9.75% |  |
Senior convertible notes due December 31, 2019 | Deerfield | Less portion of commitment asset |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes, effective interest rate |  | 8.75% |  | 8.75% |  |

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