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Fair Value Assumptions Used in Probability Weighted Approach and Monte Carlo Simulation Model (Detail) - Series 1 Preferred Stock - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Risk-free interest rate 1.84% 1.69%
Expected dividend rate 0.00% 0.00%
Expected volatility 69.90% 72.70%
Preferred stock conversion limit - percentage of outstanding common stock 19.90% 19.90%
Preferred conversion floor price $ 1.00 $ 1.00