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Components of Basic and Diluted Loss Per Share (Parenthetical) (Detail) - shares | Mar. 31, 2018 | Dec. 31, 2017
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Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |
Shares issuable upon exercise of warrants | 108,044 |
Common shares outstanding | 23,988,075 | 22,115,916
Warrants outstanding | 6,021,696 |
Common shares and new creditor warrants outstanding | 30,009,771 |
Out-of-the-money Warrants |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |
Warrants outstanding | 5,062,089 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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