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Subsequent Event - July 2019 Exchange Agreement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | Jul. 18, 2019 | Jul. 17, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Subsequent Event [Line Items] |  |  |  |
Common stock, shares issued |  |  | 189,447,055 | 187,029,967
2019 Notes Tranch 4 | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Maturity date | Jul. 18, 2019 |  |  |
2019 Notes Tranch 4 | Subsequent Event | Deerfield |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repayments of aggregate principal amount | $ 2.4 |  |  |
Common stock, shares issued | 1,514,423 |  |  |
Exchange price per share |  | $ 1.04 |  |
Conversion of notes to common shares, value | $ 1.6 |  |  |

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