Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assumption Used to Determine Fair Value of Warrant Liability (Detail)

v3.7.0.1
Fair Value Measurements - Assumption Used to Determine Fair Value of Warrant Liability (Detail)
Jun. 30, 2017
Dec. 31, 2016
Representative's Warrant [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected volatility 91.40% 73.90%
Remaining contractual term (in years) 2 years 2 months 1 day 2 years 8 months 2 days
Risk-free interest rate 1.38% 1.47%
Expected dividend yield 0.00% 0.00%
CMPO Warrants [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected volatility 84.10% 79.90%
Remaining contractual term (in years) 4 years 29 days 4 years 6 months 29 days
Risk-free interest rate 1.72% 1.93%
Expected dividend yield 0.00% 0.00%