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Consolidated Statements Of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net cash flows from operating activities:      
Net income $ 3,704,000 $ 10,778,000 $ 4,005,000
Adjustments to reconcile net income to net cash from operating activities:      
Gain from sale of business components   (7,915,000)  
Gain on sale of Medafor investment     (891,000)
Depreciation and amortization 9,745,000 8,384,000 5,863,000
Non-cash compensation 6,919,000 6,328,000 5,089,000
Write-down of inventories and deferred preservation costs 2,110,000 1,364,000 1,341,000
Deferred income taxes (1,483,000) 595,000 3,681,000
Other non-cash adjustments to income 676,000 268,000 268,000
Changes in operating assets and liabilities:      
Receivables (7,258,000) 4,142,000 (3,809,000)
Inventories and deferred preservation costs (9,369,000) (9,460,000) (2,262,000)
Prepaid expenses and other assets (2,968,000) 515,000 (1,187,000)
Accounts payable, accrued expenses, and other liabilities 8,727,000 4,720,000 (656,000)
Net cash flows provided by operating activities 10,803,000 19,719,000 11,442,000
Net cash flows used in investing activities:      
Acquisition of JOTEC, net of cash acquired (164,661,000)    
Acquisition of On-X, net of cash acquired   (91,152,000)  
Acquisition of PhotoFix technology (409,000) (1,226,000)  
Acquisition of French distribution business     (1,349,000)
Capital expenditures (6,632,000) (6,198,000) (3,490,000)
Proceeds from sale of business components 740,000 19,795,000  
Proceeds from sale of Medafor investment     891,000
Decrease in restricted cash   5,000,000  
Sales and maturities of restricted securities and investments 1,010,000 1,067,000 1,157,000
Purchases of restricted securities and investments (954,000) (1,014,000) (1,085,000)
Other (86,000) (126,000) (610,000)
Net cash flows provided by (used in) investing activities (170,992,000) (73,854,000) (4,486,000)
Net cash flows from financing activities:      
Proceeds from issuance of term loan 225,000,000 75,000,000  
Payoff of debt agreement (67,219,000)    
Payment of debt issuance costs (10,144,000) (2,289,000)  
Repayment of term loan (4,994,000) (1,406,000)  
Proceeds from exercise of stock options and issuance of common stock 3,126,000 2,203,000 1,526,000
Cash dividends paid     (3,408,000)
Redemption and repurchase of stock to cover tax withholdings (1,614,000) (697,000) (1,386,000)
Other (910,000) 617,000 458,000
Net cash flows used in financing activities 143,245,000 73,428,000 (2,810,000)
Effect of exchange rate changes on cash 279,000 (239,000) 67,000
(Decrease) increase in cash and cash equivalents (16,665,000) 19,054,000 4,213,000
Cash and cash equivalents, beginning of period 56,642,000 37,588,000 33,375,000
Cash and cash equivalents, end of period $ 39,977,000 $ 56,642,000 $ 37,588,000