Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

Subsequent Events - Additional Information (Detail) - USD ($)
3 Months Ended
Apr. 02, 2019
Mar. 31, 2019
Subsequent Event [Line Items]    
Number of Options, Granted   2,160,000
Pomerantz [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Base salary fixed $ 550,000  
Percentage of bonus on base salary 80.00%  
Number of Options, Granted 3,200,000  
Percentage of bonus common stock, which will vest as to 25% of the underlying shares on the first anniversary of Dr. Pomerantz commencing employment with the Company and as to an additional 6.25% of the underlying shares upon Dr. Pomerantz’s completion of each three months of continuous service to the Company thereafter.  
Gilman [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Percentage of bonus on last drawn salary 25.00%