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Organization and Basis of Presentation - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
May 01, 2020
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization And Basis Of Presentation [Line Items]          
Month and year of incorporation     2007-01    
Cash and cash equivalents     $ 8,068,939 $ 5,663,833 $ 5,319,004
Common stock, shares issued     26,621,954 24,431,914  
Paycheck Protection Program [Member] | COVID-19 [Member]          
Organization And Basis Of Presentation [Line Items]          
Proceeds from loan $ 104,000        
Public Offering [Member] | Subsequent Event [Member]          
Organization And Basis Of Presentation [Line Items]          
Proceeds from issuance of common stock net of underwriting discounts and commissions and offering expenses   $ 13,100,000      
Common stock, shares issued   5,750,000