Annual report pursuant to Section 13 and 15(d)

Impairment of Property and Equipment - Additional Information (Details)

v3.21.1
Impairment of Property and Equipment - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]      
Impairment of property and equipment $ 234,000 $ 0 $ 686,000