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Warrants - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Class Of Warrant Or Right [Line Items] |  |  |
Estimated fair value of warrant liability remeasurement income (expense) |  | $ 100 |
Pruchase of common stock warrants exercised |  | 23,000 |
Proceeds from exercise of warrants |  | $ 25 | $ 0
Maximum [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Proceeds from exercise of warrants |  | $ 100 |
JGB Debt [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Estimated fair value of warrant liability remeasurement income (expense) |  |  | $ 400
ASU 2017-11 [Member] | JGB Debt [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Warrant to purchase stock, shares | 1,338,326 |  |
Reclassification of warrant liability to equity | $ 6,600 |  |

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- Definition Purchase of common stock warrants exercised. + References No definition available. + Details
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- Definition Reclassification of warrant liability to equity. + References No definition available. + 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 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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