Income Tax - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Income Tax [Line Items]
Federal net operating loss carryforwards		$ 952
Operating loss carryforward for state income tax		$ 198
California
Income Tax [Line Items]
Operating loss carryforward for state income tax	$ 185
Massachusetts
Income Tax [Line Items]
Operating loss carryforward for state income tax	$ 13
Minimum | California
Income Tax [Line Items]
Operating loss carryforwards expiration period	2029
Minimum | Massachusetts
Income Tax [Line Items]
Operating loss carryforwards expiration period	2031
Minimum | Federal
Income Tax [Line Items]
Operating loss carryforwards expiration period	2022
Maximum | California
Income Tax [Line Items]
Operating loss carryforwards expiration period	2037
Maximum | Massachusetts
Income Tax [Line Items]
Operating loss carryforwards expiration period	2038
Maximum | Federal
Income Tax [Line Items]
Operating loss carryforwards expiration period	2037