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Revenue - Revenue Recognition (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
subsidiary
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Number of subsidiaries | subsidiary 3  
Percentage of Gallium 99.99%  
Accounts Receivable, Net, Current $ 19,605 $ 19,586
Accrued liabilities $ 9,556 $ 15,371
Maximum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Sales commissions benefit period 1 year