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Fair Value Assumptions Used in Probability Weighted Approach and Monte Carlo Simulation Model (Detail) - Series 1 Preferred Stock
12 Months Ended
Dec. 31, 2016
$ / shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Risk-free interest rate 1.04%
Expected dividend rate 0.00%
Expected volatility 70.50%
Preferred stock conversion limit - percentage of outstanding common stock 19.90%
Preferred conversion floor price $ 1.00