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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 18, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Stockholders Equity [Line Items]              
Preferred stock, shares authorized     5,000,000 5,000,000   5,000,000 5,000,000
Common stock, shares authorized     200,000,000 200,000,000   200,000,000 200,000,000
Common stock, par or stated value per share     $ 0.001 $ 0.001   $ 0.001 $ 0.001
Estimated commissions and allocated fees       $ 89,000 $ 42,000    
ATM Sales Agreement [Member]              
Stockholders Equity [Line Items]              
Aggregate offering price of common stock which may issue and sell under agreement   $ 12,000,000.0          
Sale of stock during the period     1,365,871 2,733,492   3,421,368  
Proceeds from issuance of common stock     $ 3,000,000.0 $ 7,400,000   $ 10,600,000  
Estimated commissions and allocated fees     $ 200,000 $ 600,000   $ 800,000  
Common Stock Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]              
Stockholders Equity [Line Items]              
Shares agreed to be issued over period under equity line financing 24 months            
Issuance of common stock to Lincoln Park Capital Fund, shares 170,088            
Common Stock Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member]              
Stockholders Equity [Line Items]              
Shares agreed to be issued under equity line financing 15.0