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Common Stock - Summary of Outstanding Warrants (Detail) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 252,721
Exercise price per Share | $ / shares | $ 44.000
Expiration Date | 2019-07
Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 60,933
Exercise price per Share | $ / shares | $ 44.000
Expiration Date | 2019-07
Series A-1 Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 21,748
Exercise price per Share | $ / shares | $ 26.400
Expiration Date | 2020-10
Warrants Issued In September 2017 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 82,237
Exercise price per Share | $ / shares | $ 3.496
Expiration Date | 2023-03

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