Basis of Presentation and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 0	$ 0	$ 0
Technology
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	3 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	15 years
Trademark
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	15 years
Referral Agreement
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	10 years