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Components of Basic and Diluted Loss Per Share (Parenthetical) (Detail) - shares | Jun. 30, 2018 | Dec. 31, 2017
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Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |
Common shares outstanding | 26,085,274 | 22,115,916
Warrants outstanding | 3,924,441 |
Common shares and new creditor warrants outstanding | 30,009,715 |
Out-of-the-money Warrants |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |
Warrants outstanding | 5,062,089 |

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