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Industry and Geographic Information - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Revenue, Major Customer [Line Items]
Number of reportable segments \| segment	1
Customer Concentration Risk \| Non-US
Revenue, Major Customer [Line Items]
Sales to customers outside the U.S.	$ 87.7	$ 84.6
Customer Concentration Risk \| Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	43.00%	44.00%
Customer Concentration Risk \| Sales \| Non-US
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	34.00%	31.00%
Geographic Concentration Risk \| Non-US
Revenue, Major Customer [Line Items]
Accounts receivable	$ 19.7		$ 23.4
Credit Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable	$ 17.2		$ 33.3