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Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) unit	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Number of reporting units | unit	1
Impairment of goodwill	$ 0
Impairment of intangible assets	0
Income tax benefit	14,523,000	$ (10,000)
Valuation allowance recorded against gross deferred tax asset	(14,500,000)		$ 34,500,000
Deferred taxes realizable	$ 14,500,000

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Deferred Taxes Realizable As A Result Of Future Reversals Of Existing Taxable Temporary Difference

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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