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Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Lessee Lease Description [Line Items]
Operating lease, expiration year	2031-02
Operating lease liabilities	$ 9,795,000	$ 0
Operating lease right-of-use assets	$ 9,524,000	0
Operating lease, description	The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 0.3 year to 6.1 years, one of which includes an option to extend the lease for one five-year term.
Operating lease, option to extend	true
Operating lease, options to extend	one of which includes an option to extend the lease for one five-year term.
Operating lease, renewal term	5 years
weighted average remaining lease term	4 years 8 months 12 days
Weighted average discount rate	8.00%
Restricted cash	$ 4,787,000	$ 4,826,000	$ 2,475,000
Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Operating leases arrangement term		10 years 9 months
Corporate Office Space Lease Agreement | Letter of Credit
Lessee Lease Description [Line Items]
Restricted cash	$ 2,200,000
CALIFORNIA | Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Minimum lease payment amount		$ 53,700,000
Lease commencement period	third quarter of 2020
Minimum
Lessee Lease Description [Line Items]
Operating lease remaining lease term	3 months 18 days
Maximum
Lessee Lease Description [Line Items]
Operating lease remaining lease term	6 years 1 month 6 days
Vehicles
Lessee Lease Description [Line Items]
Operating leases arrangement term				36 months
Vehicles | Minimum
Lessee Lease Description [Line Items]
Operating leases arrangement term				12 months
Vehicles | Maximum
Lessee Lease Description [Line Items]
Operating leases arrangement term				50 months

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