Quarterly report pursuant to Section 13 or 15(d)

Loan from National Brain Tumor Society and National Foundation for Cancer Research - Additional information (Detail)

v3.21.1
Loan from National Brain Tumor Society and National Foundation for Cancer Research - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Guarantee Obligations [Line Items]    
Warrants exercised for cash $ 4,399 $ 27
National Brain Tumor Society and National Foundation for Cancer Research [Member]    
Guarantee Obligations [Line Items]    
Loan received $ 500  
National Brain Tumor Society [Member] | Warrant [Member]    
Guarantee Obligations [Line Items]    
Warrants issued 125  
Warrants exercise price $ 1.09  
Warrants exercised for cash $ 94  
Risk-free interest rate 0.37%  
Volatility Rate 89.82%  
Expected Term 5 years  
Dividend Rate 0.00%  
National Brain Tumor Society [Member] | Promissory Note    
Guarantee Obligations [Line Items]    
Accrued interest rate 6.00%  
Debt, maturity date Jun. 19, 2021