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Common Stock - Summary of Outstanding Warrants (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017
Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2014-07
Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2014-07
Series A-1 Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2015-04
Warrants Issued In September 2017 [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2017-09

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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |