Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 25, 2021	Oct. 24, 2021	Sep. 26, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock par value (in dollars per share)			$ 0.0001	$ 0.0001
Subsequent Event
Subsequent Event [Line Items]
Common stock par value (in dollars per share)		$ 0.0001
Subsequent Event | Minimum | Amentum Merger Agreement
Subsequent Event [Line Items]
Merger agreement, right to receive amount (in dollars per share)	$ 10.05
Termination fee	$ 15.0
Subsequent Event | Maximum | Amentum Merger Agreement
Subsequent Event [Line Items]
Termination fee	$ 30.0