Annual report pursuant to Section 13 and 15(d)

Subsequent Events (unaudited) - Additional Information (Detail)

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Subsequent Events (unaudited) - Additional Information (Detail) - USD ($)
 12 Months Ended
Feb. 22, 2019
Jan. 25, 2019
Dec. 31, 2018
Subsequent Event [Line Items]      
Contingent loss on patent litigation settlement     $ (1,500,000)
Subsequent Event | Non-qualified RSUs | Employees      
Subsequent Event [Line Items]      
Granted/Issued 900,000    
Awards valued per share $ 2.26    
Options expiration period 10 years    
Options vesting description Vesting of these awards will occur quarterly based on the achievement of specific Company performance criteria.    
Settlement Agreement | Patent Litigation | Subsequent Event      
Subsequent Event [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   500,000,000  
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 loss on patent litigation settlement   $ 1,500,000