Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Additional Information (Detail)

v3.20.4
Net Loss Per Share - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Stock Options, Warrants and Convertible Preferred Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common shares excluded from the computation of diluted net loss per share on effect of anti-dilutive 10,095,000 8,516,000