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Subsequent Event - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 12, 2018 | Mar. 06, 2018 | Aug. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares issued |  |  |  | 145,619,293 | 119,053,414
Principal amount |  |  |  | $ 129.2 |
Senior convertible notes due December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion of notes to common shares, value |  | $ 1.3 |  |  |
Principal amount |  |  |  | $ 32.0 |
Senior notes, effective interest rate |  |  |  | 9.75% |
Common Stock | Senior convertible notes due December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion Option, shares |  | 441,618 |  |  |
Deerfield | Senior convertible notes due December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount |  |  |  | $ 120.0 |
Senior notes, effective interest rate |  |  |  | 9.75% |
Scenario Forecast | Deerfield | Facility Agreement Eighth Amendment | Senior convertible notes due December 31, 2019 | Tranche 4 Notes |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Defer payment of principal amount |  |  | $ 3.0 |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | Senior convertible notes due December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares issued | 7,367,839 |  |  |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | Senior convertible notes due December 31, 2019 | Tranche 4 Notes | Notes Due and Payable on December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion of notes to common shares, value | $ 3.0 |  |  |  |
Principal amount | 5.0 |  |  |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | 9.75% Senior Convertible Notes Due 2019 | Tranche 4 Notes | Notes Due and Payable on July 18, 2018 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion of notes to common shares, value | 7.0 |  |  |  |
Principal amount | $ 10.0 |  |  |  |
Senior notes, effective interest rate | 9.75% |  |  |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | 8.75% Senior Convertible Notes Due 2019 | Notes Due and Payable on December 31, 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion of notes to common shares, value | $ 2.0 |  |  |  |
Principal amount | $ 2.0 |  |  |  |
Senior notes, effective interest rate | 8.75% |  |  |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | Common Stock | Senior convertible notes due December 31, 2019 | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion price of shares | $ 2.01 |  |  |  |
Conversion Option, shares | 5,750,000 |  |  |  |
Subsequent Event | Deerfield | Facility Agreement Eighth Amendment | Common Stock | Senior convertible notes due December 31, 2019 | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion price of shares | $ 1.80 |  |  |  |

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