Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 14, 2022
Sep. 28, 2021
May 13, 2022
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Subsequent Event [Line Items]            
Underwritten public offering, description           the Company closed on the sale of (i) 7,200 shares of its common stock, par value $0.001 per share, (ii) pre-funded warrants (“PFW”) to purchase an aggregate of 4,800 shares of common stock and (iii) common warrants to purchase an aggregate of 12,000 shares of common stock (“2022 Investor Warrants”) in the Company’s registered direct offering (the “September Offering”). Each share of common stock, or PFW as applicable, was sold together with a 2022 Investor Warrant to purchase one share of common stock at a combined effective price of $1.25 per share of common stock and accompanying 2022 Investor Warrant. The 2022 Investor Warrants have been valued at $7,023 and have been treated as equity. They have been valued using a Black-Scholes valuation with a risk-free rate of 0.55%, a contractual term of 3.5 years, a volatility of 116.7%, and a dividend rate of 0%.
Stock options exercisable           4,060,000
Registered Direct Financing            
Subsequent Event [Line Items]            
Underwritten public offering, description           the Company closed on the sale of 16,266 shares of its common stock, par value $0.001 per share, and common warrants to purchase an aggregate of 16,266 shares of common stock (“2022 April Investor Warrants”) in the Company’s registered direct offering (the “April Offering”). Each share of common stock was sold together with a 2022 April Investor Warrant to purchase one share of common stock at a combined effective price of $0.53 per share of common stock and accompanying 2022 April Investor Warrant.
Warrant [Member]            
Subsequent Event [Line Items]            
Number           18,397,000
Common stock            
Subsequent Event [Line Items]            
Issued warrants to underwriters   7,200,000        
Warrants exercise price   $ 0.001        
Stock options exercised, Shares       34,000 35,000  
2022 Investor Warrant            
Subsequent Event [Line Items]            
Issued warrants to underwriters   12,000,000        
Other Underwriting Expense   $ 13,634        
Expiry date   Mar. 28, 2025        
2022 Investor Warrant | Registered Direct Financing            
Subsequent Event [Line Items]            
Number   600,000        
Subsequent Event            
Subsequent Event [Line Items]            
Stock options exercised, Shares     280,000      
Stock options exercise price     $ 1.65      
Subsequent Event | Warrant [Member]            
Subsequent Event [Line Items]            
Stock options exercisable     222,000      
Stock options, exercisable expired or forfeited, price     $ 35.35      
Subsequent Event | Common stock            
Subsequent Event [Line Items]            
Issued warrants to underwriters 16,266,000          
Warrants exercise price $ 0.001          
Subsequent Event | 2022 Investor Warrant            
Subsequent Event [Line Items]            
Issued warrants to underwriters 16,266,000          
Other Underwriting Expense $ 7,900          
Expiry date Apr. 14, 2027          
Subsequent Event | 2022 Investor Warrant | Registered Direct Financing            
Subsequent Event [Line Items]            
Warrants exercise price $ 0.6625          
Expiry date Oct. 14, 2022          
Number 811,000          
Underwriter warrants commencing date Oct. 14, 2026