For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Industry and Geographic Information - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Major Customer [Line Items]
Number of reportable segments \| Segment	1
Sales [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%
Customer Concentration Risk [Member] \| Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Sales to customers outside the U.S.	$ 41.9	$ 8.3
Accounts receivable	$ 22.0		$ 18.8
Customer Concentration Risk [Member] \| Sales [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	49.00%	59.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	25.00%	11.00%
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 58.4		$ 44.4
Credit Concentration Risk [Member] \| Accounts receivable [Member] \| Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%	10.00%