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Income Taxes - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
In-process research and development not subject to future amortization for tax purposes	$ 1,785	$ 3,438
Gross deferred tax liability	$ 1,785	$ 3,438

X

- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

+ References

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Amount of deferred tax liability attributable to taxable temporary differences from research and development costs.

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