Subsequent Events - Additional Information (Detail)	1 Months Ended
	Apr. 30, 2019 USD ($) ft²	Mar. 31, 2019 USD ($) ft²
Subsequent Event [Line Items]
Estimated lease payments		$ 14,528,257
California | Corporate Headquarters In Pasadena
Subsequent Event [Line Items]
Office space leases, in square feet | ft²		8,500
Subsequent Event | Colorado Owner, LLC | California | Corporate Headquarters In Pasadena
Subsequent Event [Line Items]
Lease term	91 months
Office space leases, in square feet | ft²	24,000
Lease payments, commencement date	Nov. 01, 2019
Estimated lease payments	$ 8,800,000
Expected leasehold improvements, net of tenant improvement allowances	$ 4,500,000
Lease term expiration, option to extend for renewal lease term	Pursuant to the lease, within twelve to fifteen months of the expiration of the term, the Company has the option to extend the lease for one additional five-year term, with certain annual increases in base rent.
Lease extend term	5 years