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Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 26, 2016 | Sep. 25, 2016 | Jun. 15, 2016 | Apr. 14, 2016 | Dec. 31, 2015
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  | $ 1,700 |  |
Warrants issued |  |  |  | 1,002,507 |  |
Common stock warrant liability | $ 5,208 |  |  |  |  | $ 0
Estimated fair value of warrant liability remeasurement charge | $ 300 |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  |  | $ 3,300 |
Warrants issued |  | 1,775,580 |  |  | 1,975,580 |
Exercise Price |  | $ 4.00 | $ 4.98 |  |  |
Private Placement [Member] | Accredited Investors [Member] |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  |  | $ 3,000 |
Warrants issued |  |  |  |  | 1,775,580 |
Private Placement [Member] | Placement Agents [Member] |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  |  | $ 300 |
Warrants issued |  |  |  |  | 200,000 |
Subsequent Financing [Member] |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Warrants issued |  | 1,002,507 |  |  |  |
Exercise Price |  | $ 4.00 | $ 4.98 |  |  |
Private Placement and Subsequent Financing [Member] |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |
Common stock warrant liability |  |  |  |  | $ 5,000 |

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- Definition Estimated fair value of warrant liability remeasurement charge. + References No definition available. + 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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- Definition Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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