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Revenue - Revenue Recognition (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) subsidiary	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of subsidiaries | subsidiary	3
Percentage of Gallium	99.99%
Accounts receivable	$ 23,308	$ 22,778
Accrued liabilities	$ 12,776	11,149
Adjustment | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable		169
Accrued liabilities		$ 169
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales commissions benefit period	1 year

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