Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation and amortization expenses		$ 11.0	$ 8.8	$ 12.6
Costs related to terminated manufacturing obligations	$ 0.9
Manufacturing Equipment
Property, Plant and Equipment [Line Items]
Original cost of impaired equipment	23.4			23.4
Net book value of impaired equipment	$ 15.1			$ 15.1