Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Fair Value of Warrants Issued (Detail)

v3.8.0.1
Common Stock - Summary of Fair Value of Warrants Issued (Detail) - Series A and Series B Warrants issued in July 2014 Financing [Member]
9 Months Ended
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rates 1.42%
Expected dividend yield 0.00%
Expected life 1 year 9 months
Expected volatility 86.06%