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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Industry and Geographic Information - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Segment	Mar. 31, 2015 USD ($)	Dec. 31, 2014	Dec. 31, 2015 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.	$ 9.8	$ 7.4
Accounts receivable	$ 6.2			$ 5.6
Customer Concentration Risk [Member] \| Sales [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	40.00%	51.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	19.00%	12.00%
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 23.6			$ 12.0
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%