Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 25, 2019
Feb. 28, 2021
Jan. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2021
Dec. 31, 2020
Commitment And Contingencies [Line Items]              
Litigation settlement share issued   500,000          
Accrued liability   $ 600,000       $ 6,237,000 $ 6,667,000
CAO Settlement Agreement | Patent Litigation              
Commitment And Contingencies [Line Items]              
Settlement agreement date January 25, 2019            
Number of days litigation settlement to be paid in cash 5 days            
Litigation settlement in cash $ 500,000            
Number of days litigation settlement shares to be issued 30 days            
Litigation settlement share issued 500,000            
Number of days litigation settlement to be paid in value of stock consideration 30 days            
Settlement agreement, terms The Company agreed (i) to pay to CAO, within five days of the Effective Date, $500,000 in cash, (ii) to issue to CAO, within 30 days of the Effective Date, 500,000 restricted shares of common stock of the Company (the “Stock Consideration”), and (iii) to pay to CAO, within 30 days of December 31, 2021, an amount in cash equal to the difference (if positive) between $1,000,000 and the value of the Stock Consideration on December 31, 2021.            
Litigation settlement amount in cash equal to difference between value of stock consideration $ 1,000,000            
Contingent loss on patent litigation settlement         $ 1,500,000    
Payment for litigation settlement in cash     $ 500,000 $ 200,000      
Accrued liability           $ 600,000 $ 1,000,000.0