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Common Stock - Summary of Fair Value of Warrants Issued (Detail) - Series A and Series B Warrants issued in July 2014 Financing [Member]
3 Months Ended
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rates 2.12%
Expected dividend yield 0.00%
Expected life 1 year 3 months
Expected volatility 88.48%