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Stock-Based Compensation - Assumptions Used for Determining Fair Value of Stock Options Under Black-Scholes Pricing Model (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2018
$ / shares
Sep. 30, 2018
$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Minimum [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock and exercise prices $ 2.75 $ 2.75
Discount rate-bond equivalent yield 2.73% 2.73%
Expected life (in years) 5 years 5 years
Expected volatility 100.00% 100.00%
Maximum [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock and exercise prices $ 6.00 $ 6.00
Discount rate-bond equivalent yield 2.97% 2.97%
Expected life (in years) 5 years 11 months 15 days 5 years 11 months 15 days
Expected volatility 120.00% 120.00%