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Borrowings - Facility Financing Obligation (2019 Notes and Tranche B Notes) - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
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Jul. 12, 2018 USD ($) $ / shares shares | Jun. 08, 2018 USD ($) $ / shares shares | Mar. 12, 2018 USD ($) shares | Mar. 06, 2018 USD ($) d $ / shares shares | Jan. 18, 2018 USD ($) d $ / shares shares | Jan. 15, 2018 USD ($) | Nov. 06, 2017 USD ($) $ / shares shares | Oct. 23, 2017 USD ($) d $ / shares shares | Jun. 29, 2017 USD ($) $ / shares shares | Apr. 18, 2017 USD ($) $ / shares shares | Aug. 31, 2018 USD ($) | Feb. 28, 2015 USD ($) | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 07, 2018 USD ($) $ / shares | Mar. 09, 2018 $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Jul. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 129,200,000 |  | $ 129,200,000 |  |  |  |  |  |
Gain (Loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 772,000 | $ (830,000) | (53,000) | $ (830,000) |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,178,000 |  | $ 26,178,000 |  |  |  | $ 43,946,000 |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  | 145,619,293 |  | 145,619,293 |  |  |  | 119,053,414 |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01 |  |
Milestone rights liability, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,201,000 |  | $ 7,201,000 |  |  |  | $ 7,201,000 |  |
Interest expense on notes |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 | 1,709,000 | $ 2,422,000 | 3,503,000 | $ 5,128,000 |  |  |  |  |
Required payment pursuant to the terms of the Milestone Agreement |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  |  |  |  | 973,236 |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  | $ 7,000,000 |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  | 8.75% |  |  |  |  |  |
Senior convertible notes due December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  | $ 32,000,000 |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  | $ 2.83 |  |  |  |  | $ 1.45 | $ 1.22 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on extinguishment of debt |  |  |  |  |  |  |  |  | $ (500,000) |  |  |  |  |  |  |  |  |  |  |  |
Cash repayment |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment amount |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and issuance costs |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  | 9.75% |  |  |  |  |  |
Senior convertible notes due December 31, 2019 | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  | 441,618 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,000,000 |  | $ 39,000,000 |  |  |  | 54,407,000 |  |
Gain (Loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  | (300,000) |  |  |  |  |  |  |  |  |  |  |
2019 Notes and Tranche B Notes | Fourth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment of credit facility principal amount |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Tranche B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  | 20,000,000 |  |  |  |  |  |
Deerfield | Tranche B Exchange Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  | 1,838,236 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.72 |  |  |
Deerfield | Milestone Rights Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments, remain payable amount |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  | 75,000,000 |  |  |  |  |  | $ 75,000,000
Deerfield | Milestone Rights Liability | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  | 90,000,000 |  |  |  |  |  | $ 90,000,000
Deerfield | Senior convertible notes due December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 120,000,000 |  | 120,000,000 |  |  |  |  |  |
Milestone rights liability, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  | 7,200,000 |  |  |  | 7,200,000 |  |
Remaining milestone rights liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,800,000 |  | $ 8,800,000 |  |  |  | 8,800,000 |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  | 9.75% |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone rights liability, current |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  | $ 1,600,000 |  |  |  | $ 1,600,000 |  |
Deerfield | Senior convertible notes due December 31, 2019 | Fifth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment of credit facility principal amount |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Sixth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  | $ 2.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment of credit facility principal amount |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  | 1,267,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Seventh Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  | 3,061,224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  | $ 1.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Seventh Amendment to Facility Agreement | 2019 Notes Due And Payable On July 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Facility Agreement Third Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash repayment of senior notes under exchange agreement |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  |  |  | 3,584,230 |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  | $ 1.395 |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Facility Agreement Eighth Amendment | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares | 7,367,839 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Minimum | Seventh Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Minimum | Facility Agreement Third Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Deerfield | Senior convertible notes due December 31, 2019 | Minimum | Facility Agreement Eighth Amendment | Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares | $ 1.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Maximum | Facility Agreement Eighth Amendment | Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares | 5,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares | $ 2.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash repayment of senior notes under exchange agreement |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  | 8.75% |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  |  |  |  | 869,565 |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.15 |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Fourth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  | 1,720,846 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  |  |  |  |  | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Sixth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  |  |  | $ 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Seventh Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  | $ 2.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.75 |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Seventh Amendment to Facility Agreement | Tranche B Notes Due and Payable on December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Common Stock | Sixth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Exchange Shares | Maximum | Seventh Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  | 9,558,382 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche 1 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  |  |  |  | 4,347,826 |  |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche 4 Notes | Facility Agreement Eighth Amendment | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash repayment of senior notes under exchange agreement |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche 4 Notes | Facility Agreement Eighth Amendment | Notes Due and Payable on December 31, 2019 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | 2019 Notes and Tranche B Notes | Tranche B Exchange Shares | Fourth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  |  |  |  |  |  | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | 2019 Notes and Tranche B Notes | Tranche B Exchange Shares | Maximum | Common Stock | Fourth Amendment to Facility Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | 9.75% Senior Convertible Notes Due 2019 | Tranche 4 Notes | Facility Agreement Eighth Amendment | Notes Due and Payable on July 18, 2018 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | 8.75% Senior Convertible Notes Due 2019 | Facility Agreement Eighth Amendment | Notes Due and Payable on December 31, 2019 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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