Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Outstanding Series C Agent Warrants (Detail)

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Stockholders' Equity - Schedule of Outstanding Series C Agent Warrants (Detail) - Series C Warrants [Member] - $ / shares
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Number 2,444 2,444
Number of conversion shares (in thousands) 2,100,000  
Cumulative common stock dividends 1,470,000  
Series 1 Warrants Outstanding    
Number 1,929  
Warrants exercise price $ 1.16  
Number of conversion shares (in thousands) 1,663,000  
Cumulative common stock dividends 1,164,000  
Series 2 Warrants Outstanding Member    
Number 219  
Warrants exercise price $ 1.21  
Number of conversion shares (in thousands) 180,000  
Cumulative common stock dividends 126,000  
Series 3 Warrants Outstanding    
Number 296  
Warrants exercise price $ 1.15  
Number of conversion shares (in thousands) 257,000  
Cumulative common stock dividends 180,000