Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net cash flows from operating activities:
Net income (loss)	$ 1,720	$ (2,840)	$ 3,704
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	18,317	18,095	9,745
Non-cash compensation	8,799	6,325	6,919
Non-cash lease expense	5,009
Write-down of inventories and deferred preservation costs	1,488	649	2,110
Deferred income taxes	(2,305)	(4,485)	(1,483)
Other	2,182	2,149	676
Changes in operating assets and liabilities:
Receivables	(5,332)	(1,119)	(7,258)
Inventories and deferred preservation costs	(8,125)	2,384	(9,369)
Prepaid expenses and other assets	(6,177)	(2,407)	(2,968)
Accounts payable, accrued expenses, and other liabilities	251	(8,870)	8,727
Net cash flows provided by operating activities	15,827	9,881	10,803
Net cash flows used in investing activities:
Payments for Endospan Agreements	(15,000)
Capital expenditures	(8,072)	(5,786)	(6,632)
Acquisition of JOTEC, net of cash acquired			(164,661)
Acquisition of PhotoFix technology			(409)
Proceeds from sale of business components			740
Other	(871)	(929)	(86)
Net cash flows used in investing activities	(23,943)	(6,715)	(171,048)
Net cash flows from financing activities:
Repayment of term loan	(2,780)	(2,790)	(4,994)
Payment of debt issuance costs		(624)	(10,144)
Proceeds from issuance of term loan			225,000
Payoff of debt agreement			(67,219)
Proceeds from exercise of stock options and issuance of common stock	4,758	3,854	3,126
Redemption and repurchase of stock to cover tax withholdings	(2,743)	(2,100)	(1,614)
Other	(728)	(902)	(910)
Net cash flows (used in) provided by financing activities	(1,493)	(2,562)	143,245
Effect of exchange rate changes on cash	1,667	879	412
(Decrease) increase in cash, cash equivalents, and restricted securities	(7,942)	1,483	(16,588)
Cash, cash equivalents, and restricted securities, beginning of year	42,236	40,753	57,341
Cash, cash equivalents, and restricted securities, end of year	$ 34,294	$ 42,236	$ 40,753