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Warrants - Outstanding Warrants To Purchase Common Stock Warrants (Parenthetical) (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 26, 2016 | Sep. 25, 2016 | Jan. 30, 2015
Private Placement [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise Price |  | $ 4.00 | $ 4.98 |
Subsequent Financing [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise Price |  | 4.00 | 4.98 |
Common Stock [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise Price |  |  |  | $ 6.96
Common Stock [Member] | Private Placement [Member] | Accredited Investors [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Warrants, issued date | Apr. 14, 2016 |  |  |
Exercise Price |  | 4.00 | 4.98 |
Common Stock [Member] | Private Placement [Member] | Placement Agents [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Warrants, issued date | Apr. 14, 2016 |  |  |
Common Stock [Member] | Subsequent Financing [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Warrants, issued date | Jun. 15, 2016 |  |  |
Exercise Price |  | $ 4.00 | $ 4.98 |

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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + 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)(3)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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