Annual report pursuant to Section 13 and 15(d)

Certain Balance Sheet Items - Additional Information (Detail)

v3.21.1
Certain Balance Sheet Items - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Depreciation and amortization expense $ 0.6 $ 0.6