Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities
Net Loss	$ (18,467)	$ (18,913)
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities:
Stock-based compensation	7,521	10,543
Deferred taxes	(8,665)	(9,032)
Depreciation and amortization	33,568	33,739
Acquired in-process research and development ("IPR&D")	0	3,753
Non-cash interest	1,718	1,288
Asset impairment charge	0	104
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(10,921)	(11,616)
Inventories, net	8,773	(1,151)
Prepaid expenses and other current assets	1,421	637
Accounts payable	396	(146)
Accrued royalties	(2,411)	1,004
Current income taxes payable, net	(6,936)	(545)
Accrued government rebates	3,887	2,777
Returned goods reserve	5,091	6,456
Accrued expenses, accrued compensation, and other	532	2,078
Net Cash and Cash Equivalents Provided by Operating Activities	15,507	20,976
Cash Flows From Investing Activities
Acquisition of product rights, IPR&D, and other related assets	(21,069)	(62,178)
Acquisition of property and equipment, net	(2,201)	(4,025)
Net Cash and Cash Equivalents Used in Investing Activities	(23,270)	(66,203)
Cash Flows From Financing Activities
Payments on Term Loan and Delayed Draw Term Loan agreements	(8,034)	(5,657)
Borrowings under Revolver agreement	24,000	15,000
Payments on Revolver agreement	0	(7,500)
Proceeds from stock option exercises and ESPP purchases	336	449
Payments of debt issuance costs	(262)	0
Treasury stock purchases for restricted stock vests	(889)	(1,523)
Net Cash and Cash Equivalents Provided by Financing Activities	15,151	769
Net Change in Cash and Cash Equivalents	7,388	(44,458)
Cash and cash equivalents, and restricted cash, beginning of period	12,867	67,361
Cash and cash equivalents, and restricted cash, end of period	20,255	22,903
Reconciliation of cash, cash equivalents, and restricted cash, beginning of period
Cash and cash equivalents	7,864	62,332
Restricted cash	5,003	5,029
Cash and cash equivalents, and restricted cash, beginning of period	12,867	67,361
Reconciliation of cash, cash equivalents, and restricted cash, end of period
Cash and cash equivalents	15,254	17,900
Restricted cash	5,001	5,003
Cash and cash equivalents, and restricted cash, end of period	20,255	22,903
Supplemental disclosure for cash flow information:
Cash paid for interest, net of amounts capitalized	5,922	5,080
Cash paid for income taxes	8,360	4,878
Supplemental non-cash investing and financing activities:
Acquisition of product rights, IPR&D, and other related assets included in returned goods reserve and derivatives and other non-current liabilities	0	399
Property and equipment purchased and included in accounts payable	$ 28	$ 223