Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Avenue's Contingently Issuable Warrants with option pricing model (Detail)

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Fair Value Measurements - Avenue's Contingently Issuable Warrants with option pricing model (Detail)
9 Months Ended
Sep. 30, 2016
Avenue [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Risk-free interest rate 1.60%
Expected dividend yield 0.00%
Expected term in years 9 years 1 month 2 days
Expected volatility 83.00%
Probability of issuance of the warrant 50.00%
Mustang [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Risk-free interest rate 1.60%
Expected dividend yield 0.00%
Expected term in years 9 years 9 months 4 days
Expected volatility 76.70%
Probability of issuance of the warrant 100.00%