Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Outstanding Warrants Valuation Assumption (Detail)

v3.8.0.1
Stockholders' Equity - Outstanding Warrants Valuation Assumption (Detail) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Risk-free interest rate 1.62% 1.20%
Expected life (in years) 2 years 4 months 21 days 2 years 3 months
Dividend yield 0.00% 0.00%
Volatility 154.00% 76.00%
Stock price $ 6.97 $ 3.07