Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Warrant Liabilities And Convertible Notes At Fair Value (Detail)

v3.7.0.1
Fair Value Measurements - Warrant Liabilities And Convertible Notes At Fair Value (Detail) - $ / shares
 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Warrants Issuable [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate   1.93%
Expected dividend yield   0.00%
Expected term in years   4 years 6 months
Expected volatility   97.76%
Helocyte [Member] | Convertible Debt [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected dividend yield 0.00%  
Expected volatility 59.10%  
Helocyte [Member] | Minimum [Member] | Convertible Debt [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.14%  
Expected term in years 6 months  
Helocyte [Member] | Maximum [Member] | Convertible Debt [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.298%  
Expected term in years 1 year 4 months 28 days  
Helocyte [Member] | Warrant [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected dividend yield 0.00%  
Expected volatility 70.00%  
Strike price $ 0.44  
Helocyte [Member] | Warrant [Member] | Minimum [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.72%  
Expected term in years 4 years  
Helocyte [Member] | Warrant [Member] | Maximum [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.792%  
Expected term in years 4 years 5 months 1 day