Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Aug. 01, 2019	Jun. 14, 2019
Assets Acquired
Goodwill	$ 353,622	$ 353,193
Fibrovein Holdings Limited
Assets Acquired
Trade receivables			$ 277
Inventories			843
Prepaid expenses and other assets			49
Goodwill			4,975
Total assets acquired			16,572
Liabilities Assumed
Trade payables			(53)
Accrued expenses			(29)
Deferred income tax liabilities			(1,890)
Total liabilities assumed			(1,972)
Total net assets acquired			14,600
Fibrovein Holdings Limited | Developed technology
Assets Acquired
Intangible assets			$ 10,428
Brightwater
Assets Acquired
Trade receivables				$ 55
Inventories				349
Property and equipment				409
Other long-term assets				30
Goodwill				17,607
Total assets acquired				50,743
Liabilities Assumed
Trade payables				(58)
Accrued expenses				(261)
Other long-term liabilities				(1,522)
Deferred income tax liabilities				(4,263)
Total liabilities assumed				(6,104)
Total net assets acquired				44,639
Brightwater | Developed technology
Assets Acquired
Intangible assets				31,960
Brightwater | Customer Lists
Assets Acquired
Intangible assets				83
Brightwater | Trademarks
Assets Acquired
Intangible assets				$ 250