Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net cash flows from operating activities:
Net (loss) income	$ (13,224)	$ 2,401
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	14,818	13,257
Non-cash compensation	7,432	6,581
Non-cash lease expense	5,324	3,491
Change in fair value of long-term loan	4,949
Deferred income taxes	(4,916)	(1,064)
Non-cash interest expense	2,261	1,266
Other non-cash adjustments to net (loss) income	1,631	1,328
Changes in operating assets and liabilities:
Receivables	7,718	(4,496)
Inventories and deferred preservation costs	(19,744)	(3,864)
Prepaid expenses and other assets	(2,560)	(3,020)
Accounts payable, accrued expenses, and other liabilities	3,230	(1,113)
Net cash flows provided by operating activities	6,919	14,767
Net cash flows from investing activities:
Acquisition of Ascyrus Medical, net of cash acquired	(59,643)
Payments for Endospan agreements	(5,000)	(15,000)
Capital expenditures	(5,171)	(5,222)
Other	(968)	(531)
Net cash flows used in investing activities	(70,782)	(20,753)
Net cash flows from financing activities:
Proceeds from issuance of convertible debt	100,000
Proceeds from revolving line of credit	30,000
Proceeds from financing insurance premiums	2,816
Proceeds from exercise of stock options and issuance of common stock	2,079	4,519
Repayment of revolving line of credit	(30,000)
Payment of debt issuance costs	(3,647)
Repayment of debt	(3,727)	(2,072)
Redemption and repurchase of stock to cover tax withholdings	(1,768)	(2,723)
Other	(463)	(560)
Net cash flows provided by (used in) financing activities	95,290	(836)
Effect of exchange rate changes on cash, cash equivalents, and restricted securities	(1,086)	1,763
Increase (decrease) in cash, cash equivalents, and restricted securities	30,341	(5,059)
Cash, cash equivalents, and restricted securities, beginning of year	34,294	42,236
Cash, cash equivalents, and restricted securities, end of year	$ 64,635	$ 37,177