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) - Warrant [Member] - Avenue [Member]
6 Months Ended
Jun. 30, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Risk-free interest rate 1.78%
Expected dividend yield 0.00%
Expected term in years 9 years 7 months 2 days
Expected volatility 83.00%
Probability of issuance of the warrant 45.00%