Annual report pursuant to Section 13 and 15(d)

401(k) Plan (Details)

v3.20.4
401(k) Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Defined contribution plan, cost $ 0.8 $ 0.7 $ 0.6