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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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