Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Feb. 17, 2017	Jan. 06, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization expense			$ 1,800	$ 2,400	$ 11,000
Impairment charge			200	1,300	140,600
Property and equipment impairment			203	1,259	140,412
Cash received from property, plant and equipment			$ 24	17	82
Property and Equipment Impairment
Depreciation and Other Amortization Expenses [Line Items]
Property and equipment impairment				700
Asset held for sale
Depreciation and Other Amortization Expenses [Line Items]
Impairment charge				600
Danbury Facility
Depreciation and Other Amortization Expenses [Line Items]
Impairment charge					$ 138,600
Land, Buildings and Improvements | California
Depreciation and Other Amortization Expenses [Line Items]
Amount of divestiture of long-lived		$ 17,300
Cash received from property, plant and equipment	$ 17,300
Net cash received from property, plant and equipment		16,700
Payments for commissions and other fees		$ 600
Carrying value of the asset held for sale				$ 16,700