Annual report pursuant to Section 13 and 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)
1 Months Ended 12 Months Ended
Feb. 17, 2015
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate   0.10%
Expected volatility   9.30%
Warrant [Member] | Avenue [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.97% 2.27%
Expected dividend yield 0.00% 0.00%
Expected term in years 10 years 9 years 10 months 2 days
Expected volatility 83.00% 83.00%
Probability of issuance of the warrant 25.00% 25.00%