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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