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Property and Equipment - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Feb. 17, 2017	Jan. 06, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Depreciation and Other Amortization Expenses [Line Items]
Loss on impairment of property and equipment			$ 111,000		$ 111,000
Cash received from property, plant and equipment					24,000	$ 17,000
Land, Buildings and Improvements \| California
Depreciation and Other Amortization Expenses [Line Items]
Amount of divestiture of long-lived		$ 17,300,000
Cash received from property, plant and equipment	$ 17,300,000
Net cash received from property, plant and equipment		16,700,000
Payments for commissions and other fees		$ 600,000
Construction in Progress
Depreciation and Other Amortization Expenses [Line Items]
Loss on impairment of property and equipment			$ 100,000	$ 0	$ 100,000	$ 0