Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross book value	$ 217,559	$ 42,695
Accumulated amortization	(16,967)	(7,394)
Foreign currency translation	(1,356)	(712)
Net book value	199,236	34,589
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross book value	93,500	0
Accumulated amortization	(2,338)	0
Foreign currency translation	0	0
Net book value	91,162	0
Trademark
Finite-Lived Intangible Assets [Line Items]
Gross book value	79,400	0
Accumulated amortization	(1,985)	0
Foreign currency translation	0	0
Net book value	77,415	0
Referral agreement
Finite-Lived Intangible Assets [Line Items]
Gross book value	37,127	35,323
Accumulated amortization	(5,417)	(1,890)
Foreign currency translation	(1,356)	(712)
Net book value	30,354	32,721
Technology
Finite-Lived Intangible Assets [Line Items]
Gross book value	7,200	7,200
Accumulated amortization	(7,200)	(5,500)
Foreign currency translation	0	0
Net book value	0	1,700
Patent licenses
Finite-Lived Intangible Assets [Line Items]
Gross book value	332	172
Accumulated amortization	(27)	(4)
Foreign currency translation	0	0
Net book value	$ 305	$ 168