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Net Loss per Common Share - Anti-Dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares | 9 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 1,397 | 21,394 | 7,276,369 | 1,211,864
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 155 | 118 | 41,356 | 47,221
Unvested Restricted Shares [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 289 | 54 | 18,993 | 35,955
Warrants [Member] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 953 | 21,221 | 7,216,020 | 1,128,688

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- Definition Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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