Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
Loan from National Brain Tumor Society and National Foundation for Cancer Research - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Guarantee Obligations [Line Items]    
Warrants exercised for cash $ 4,404 $ 51
National Brain Tumor Society and National Foundation for Cancer Research [Member]    
Guarantee Obligations [Line Items]    
Loan received 500  
National Brain Tumor Society [Member]    
Guarantee Obligations [Line Items]    
Repayment of loan 500  
Repayment of loan interest $ 30  
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 [Member]    
Guarantee Obligations [Line Items]    
Accrued interest rate 6.00%  
Debt, maturity date Jun. 19, 2021