Leases - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2021	Feb. 28, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Lessee Lease Description [Line Items]
Right-of-use asset	$ 2,860,000		$ 2,860,000		$ 2,860,000			$ 210,000	$ 300,000
Operating lease, liability	$ 2,985,000		2,985,000		2,985,000
Operating lease expense			$ 400,000	$ 63,000	$ 800,000	$ 91,000
California
Lessee Lease Description [Line Items]
Operating lease, term of contract	12 months 15 days		12 months 15 days		12 months 15 days
Operating sublease, term of contract	12 months
Operating lease, lease not yet commenced, term of contract							5 years
Operating lease, lease not yet commenced, monthly lease payments					$ 57,638
Operating lease, lease not yet commenced, rate of annual increases to rent	3.00%		3.00%		3.00%
Right-of-use asset	$ 3,200,000		$ 3,200,000		$ 3,200,000
Operating lease, liability	$ 3,200,000		$ 3,200,000		$ 3,200,000
Operating lease, weighted average discount rate	5.40%		5.40%		5.40%
Operating lease, weighted average remaining lease term	5 years		5 years		5 years
Total rent payment	$ 2,700,000
California | Level Home, Inc.
Lessee Lease Description [Line Items]
Operating sublease, term of contract		8 months
Monthly rental payment		$ 38,766