Accrued Expenses - Additional Information (Detail) - Dunkirk, NY - Manufacturing Facility $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Accrued Liabilities [Line Items]
Accrued construction costs to be funded	$ 19.5
Accrued construction costs received	8.7
Prepaid Expenses and Other Current Assets
Accrued Liabilities [Line Items]
Accrued construction costs to be funded	$ 10.8