Consolidated Statements Of Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2016	$ 342,000	$ 187,061,000	$ 34,143,000	$ (429,000)	$ (12,134,000)	$ 208,983,000
Balance, shares at Dec. 31, 2016	34,230,000				(1,356,000)
Net income (loss)			3,704,000			3,704,000
Foreign currency translation gain (loss)				2,286,000		2,286,000
Comprehensive income (loss)						5,990,000
Stock issued for JOTEC transaction	$ 27,000	53,092,000				53,119,000
Stock issued for JOTEC transaction, shares	2,683,000
Equity compensation	$ 3,000	7,310,000				7,313,000
Equity compensation, shares	311,000
Exercise of options	$ 4,000	2,476,000			$ (585,000)	1,895,000
Exercise of options, shares	393,000				(30,000)
Employee stock purchase plan	$ 1,000	1,230,000				$ 1,231,000
Employee stock purchase plan, shares	93,000					93,000
Redemption and repurchase of stock to cover tax withholdings	$ (1,000)	(1,613,000)				$ (1,614,000)
Redemption and repurchase of stock to cover tax withholdings, shares	(92,000)
Balance at Dec. 31, 2017	$ 376,000	249,935,000	37,609,000	1,857,000	$ (12,719,000)	277,058,000
Balance, shares at Dec. 31, 2017	37,618,000				(1,386,000)
Cumulative effect of adjustment | ASU 2016-09 [Member]		379,000	(238,000)			141,000
Net income (loss)			(2,840,000)			(2,840,000)
Foreign currency translation gain (loss)				(7,929,000)		(7,929,000)
Comprehensive income (loss)						(10,769,000)
Stock issued for JOTEC transaction, shares
Equity compensation	$ 3,000	6,806,000				6,809,000
Equity compensation, shares	287,000
Exercise of options	$ 5,000	4,382,000			$ (1,872,000)	2,515,000
Exercise of options, shares	578,000				(98,000)
Employee stock purchase plan	$ 1,000	1,338,000				$ 1,339,000
Employee stock purchase plan, shares	83,000					83,000
Redemption and repurchase of stock to cover tax withholdings		(2,100,000)				$ (2,100,000)
Redemption and repurchase of stock to cover tax withholdings, shares	(103,000)
Balance at Dec. 31, 2018	$ 385,000	260,361,000	34,984,000	(6,072,000)	$ (14,591,000)	275,067,000
Balance, shares at Dec. 31, 2018	38,463,000				(1,484,000)
Cumulative effect of adjustment | ASU 606 [Member]			215,000			215,000
Net income (loss)			1,720,000			1,720,000
Foreign currency translation gain (loss)				(2,517,000)		(2,517,000)
Comprehensive income (loss)						(797,000)
Equity compensation	$ 2,000	9,409,000				9,411,000
Equity compensation, shares	254,000
Exercise of options	$ 3,000	3,292,000				3,295,000
Exercise of options, shares	334,000
Employee stock purchase plan	$ 1,000	1,462,000				$ 1,463,000
Employee stock purchase plan, shares	61,000					61,000
Redemption and repurchase of stock to cover tax withholdings	$ (1,000)	(2,742,000)				$ (2,743,000)
Redemption and repurchase of stock to cover tax withholdings, shares	(94,000)
Balance at Dec. 31, 2019	$ 390,000	271,782,000	36,704,000	$ (8,589,000)	$ (14,591,000)	$ 285,696,000
Balance, shares at Dec. 31, 2019	39,018,000				(1,484,000)
Cumulative effect of adjustment | ASU 2016-09 [Member]		$ 379,000	$ (238,000)