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 9 Months Ended 12 Months Ended
Jan. 25, 2019
Jan. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Commitment And Contingencies [Line Items]          
Accrued liability     $ 4,950,000 $ 4,950,000 $ 7,538,000
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 has 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 gain (loss) on patent litigation settlement     0 $ 0 $ (1,500,000)
Payment for litigation settlement in cash   $ 500,000      
Accrued liability     $ 1,000,000 $ 1,000,000