Business and Operations - Revision of Previously Issued Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Goodwill	$ 9,905		$ 10,099	$ 100,428
Intangible assets, net	14,767		15,500	39,264
Accumulated other comprehensive loss	(10,017)		(10,017)	(6,716)
Accumulated deficit	(548,917)		(539,493)	(317,146)
Depreciation and amortization	2,645	$ 2,679
Operating loss	(8,996)	(14,385)
Net loss	(9,424)	(15,834)	(222,300)
Foreign currency translation loss	0	(3,150)
Comprehensive loss	$ (9,424)	(18,984)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Goodwill				101,375
Intangible assets, net				39,658
Accumulated other comprehensive loss			(5,608)	(5,389)
Accumulated deficit			(543,902)	(317,132)
Depreciation and amortization		2,726
Operating loss		(14,432)
Net loss		(15,881)
Foreign currency translation loss		(97)
Comprehensive loss		(15,978)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Goodwill				(947)
Intangible assets, net				(394)
Accumulated other comprehensive loss			(4,409)	(1,327)
Accumulated deficit			$ 4,409	$ (14)
Depreciation and amortization		(47)
Operating loss		47
Net loss		47
Foreign currency translation loss		(3,053)
Comprehensive loss		$ (3,006)