XML 76 R61.htm IDEA: XBRL DOCUMENT v3.20.4
Defined Contribution Plan - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Defined contribution plan, contribution amount $ 0.5 $ 0.3 $ 0.2