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Warrants - Outstanding Warrants To Purchase Common Stock Warrants (Parenthetical) (Detail) - $ / shares |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Oct. 10, 2017 | Jul. 03, 2017 | Jul. 02, 2017 | Mar. 15, 2017 | Sep. 26, 2016 | Sep. 25, 2016
JGB Debt [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion | 1,022,544 | 6,415,039 | 6,415,039 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Warrants issued |  | 3,633,565 |  |  |  |  |  |  |
Common Stock [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Warrants, issued date |  | Mar. 15, 2017 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Common Stock [Member] | Conditional Share Purchase Agreement [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  |  | $ 1.12 |  | $ 5.00 |  |
Shares issued upon conversion | 1,022,544 |  |  |  |  |  |  |  |
Warrants issued |  |  |  |  |  |  | 1,250,000 |  |
Common Stock [Member] | Conditional Share Purchase Agreement [Member] | Accredited Investors [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  |  | 1.12 | $ 4.00 |  |  |
Shares issued upon conversion | 1,022,544 |  |  |  |  |  |  |  |
Common Stock [Member] | Conditional Share Purchase Agreement [Member] | Placement Agents [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  |  | 1.12 | $ 3.99 |  |  |
Shares issued upon conversion | 1,022,544 |  |  |  |  |  |  |  |
Common Stock [Member] | Conditional Share Purchase Agreement [Member] | Former Majority Shareholders [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  |  | $ 4.82 |  |  |  |
Warrants issued |  |  |  |  | 1,296,679 |  |  |  |
Common Stock [Member] | Subsequent Private Placement [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  |  |  |  |  | $ 4.00 | $ 4.98
Common Stock [Member] | 2017 Public Offering [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |  |
Exercise Price |  |  |  | $ 4.67 | $ 4.82 |  |  |  |
Warrants issued |  | 1,296,679 |  | 1,338,326 |  |  |  |  |

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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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