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 (Details) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Major Customer [Line Items]
Number of reportable segments \| segment	1
Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%
Customer Concentration Risk \| Non-U.S. Customers
Revenue, Major Customer [Line Items]
Sales to customers outside the U.S.	$ 84.6	$ 14.7
Accounts receivable	$ 18.9		$ 18.8
Customer Concentration Risk \| Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	44.00%	53.00%
Customer Concentration Risk \| Sales \| Non-U.S. Customers
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	31.00%	13.00%
Credit Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable	$ 19.9		$ 44.4
Credit Concentration Risk \| Accounts receivable \| Minimum
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%		10.00%