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)
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Series A Warrants [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 2,779,932
Exercise price per unit of warrant $ 4.00
Expiration Date 2019-07
Series B Warrants [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 670,269
Exercise price per unit of warrant $ 4.00
Expiration Date 2019-07
Series A-1 Units [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 239,234
Exercise price per unit of warrant $ 2.40
Expiration Date 2020-10
Warrant [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 1,587,301
Exercise price per unit of warrant $ 20.00
Expiration Date 2015-10