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Employee Benefit Plan
 12 Months Ended
Dec. 31, 2020
Postemployment Benefits [Abstract]  
Employee Benefit Plan
(14)
Employee Benefit Plan
The Company’s 401(k) plan covers all of the U.S. employees beginning the first of the month following the first 90 days of their employment. Under this plan, employees may elect to contribute up to 
20
%
of their annual compensation to the 401(k) plan up to the statutorily prescribed annual limit. The Company matches 
100
%
of the employee’s elective deferrals up to 
4
%
of their annual compensation. The Company may make discretionary contributions to the 401(k) plan, but there were
 
no
discretionary contributions during the year ended December 
31
,
2019
. The Company’s contribution expense was $
0.2 million
for the year ended December 
31
,
2020
.