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Industry and Geographic Information - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2017	Dec. 31, 2018 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.	$ 41.5	$ 41.9
Accounts receivable	$ 23.1			$ 23.4
Customer Concentration Risk \| Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	47.00%	49.00%
Customer Concentration Risk \| Sales \| Non-U.S. Customers
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	28.00%	25.00%
Credit Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable	$ 37.6			$ 33.3
Credit Concentration Risk \| Accounts receivable \| Minimum
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%		10.00%