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v3.19.1

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 |

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