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Summary of Significant Accounting Policies - Other Income (Expense), Net and Accounting leases (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Other Income (Expense), Net |
Government subsidy from a foreign government | $ 1.2
General and administrative expense. |
Accounting for Leases |
Lease exit costs | $ 0.3

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