Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Outstanding Warrants (Detail)

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Common Stock - Summary of Outstanding Warrants (Detail)
3 Months Ended
Mar. 31, 2018
$ / 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