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		12 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 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.	$ 8.3	$ 9.8
Accounts receivable	$ 4.1		$ 6.8
Customer Concentration Risk [Member] \| Sales [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	59.00%	40.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	11.00%	19.00%
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 14.7		$ 13.9
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%