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Fair Value Assumptions and Methodology for Assets and Liabilities (Detail) - Warrant
1 Months Ended 12 Months Ended
Jun. 13, 2017
May 21, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Risk-free interest rate 1.51% 1.78% 1.93%
Expected volatility 88.00% 89.00% 98.00%
Expected term in years 4 years 7 months 6 days 4 years 7 months 6 days 5 years
Dividend yield 0.00% 0.00% 0.00%