Income Taxes - Reconciliation of Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory tax rate	12.50065%	12.50%	12.50%
Differences in international tax rates	3.20%	8.00%	22.20%
Nondeductible changes in fair value of contingent consideration	(0.30%)	4.00%	(11.60%)
Intercompany asset transfer	21.20%	0.00%	0.00%
Change in valuation allowances	(19.10%)	(5.30%)	(0.70%)
Nondeductible stock-based compensation	(2.70%)	(1.30%)	(0.40%)
Cross border merger	0.00%	0.00%	0.30%
Unrealized tax benefits	0.70%	(1.30%)	1.40%
State and local taxes (net of federal)	0.00%	(0.30%)	0.30%
Change in U.S. tax law	0.00%	(0.20%)	3.80%
Nondeductible interest expense	(2.50%)	(1.10%)	0.00%
Other	0.90%	0.70%	(1.50%)
Effective income tax rate	13.90%	15.70%	26.30%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax (benefit) provision - at statutory tax rate	$ (4,823)	$ (14,149)	$ 11,582
Differences in international tax rates	(1,218)	(9,039)	20,557
Nondeductible changes in fair value of contingent consideration	121	(4,559)	(10,779)
Intercompany asset transfer	(8,190)	0	0
Change in valuation allowances	7,379	5,998	(610)
Nondeductible stock-based compensation	1,039	1,499	(375)
Cross-border merger	0	0	265
Unrecognized tax benefits	(261)	1,440	1,296
State and local taxes (net of federal)	(7)	299	252
Change in U.S. tax law	0	274	3,513
Nondeductible interest expense	982	1,269	0
Other	(378)	(925)	(1,312)
Income tax (benefit) provision	$ (5,356)	$ (17,893)	$ 24,389