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Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 9 Months Ended |
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Sep. 30, 2018 | Jun. 19, 2018
Class of Warrant or Right [Line Items] |  |
Exercise price per Share |  | $ 4.00
Series A Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 25,272 |
Exercise price per Share | $ 440.00 |
Expiration Date | 2019-07 |
Series B Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 6,093 |
Exercise price per Share | $ 440.00 |
Expiration Date | 2019-07 |
Series A-1 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 2,175 |
Exercise price per Share | $ 264.00 |
Expiration Date | 2020-10 |
Warrants Issued In September 2017 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 8,224 |
Exercise price per Share | $ 34.96 |
Expiration Date | 2023-03 |
Warrants Issued In June 2018 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 3,132,000 |
Exercise price per Share | $ 4.00 |
Expiration Date | 2023-06 |

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