Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows From Operating Activities
Net (loss)/income	$ (18,913)	$ 10,929
Adjustments to reconcile net income/(loss) to net cash and cash equivalents provided by operating activities:
Stock-based compensation	10,543	6,773
Deferred taxes	(9,032)	(6,433)
Depreciation and amortization	33,739	35,048
Acquired in-process research and development ("IPR&D")	3,753	2,653
Non-cash interest	1,288	5,679
Asset impairment charge	104	0
Changes in operating assets and liabilities:
Accounts receivable, net	(11,616)	(5,858)
Inventories, net	(1,151)	(5,671)
Prepaid expenses and other current assets	637	(510)
Accounts payable	(146)	2,130
Accrued royalties	1,004	(2,929)
Current income taxes, net	(545)	(5,836)
Accrued government rebates	2,777	210
Returned goods reserve	6,456	3,393
Accrued expenses, accrued compensation, and other	2,078	1,250
Net Cash and Cash Equivalents Provided by Operating Activities	20,976	40,828
Cash Flows From Investing Activities
Acquisition of product rights, IPR&D, and other related assets	(62,178)	(21,243)
Acquisition of property and equipment, net	(4,025)	(4,932)
Net Cash and Cash Equivalents Used in Investing Activities	(66,203)	(26,175)
Cash Flows From Financing Activities
Payments on Term Loan and Delayed Draw Term Loan agreements	(5,657)	(1,805)
Borrowings under Revolver agreement	15,000	0
Payments on Revolver agreement	(7,500)	0
Proceeds from stock option exercises and ESPP purchases	449	4,852
Treasury stock purchases for restricted stock vests	(1,523)	(1,031)
Net Cash and Cash Equivalents Provided by Financing Activities	769	2,016
Net Change in Cash and Cash Equivalents	(44,458)	16,669
Cash and cash equivalents, beginning of period	67,361	48,029
Cash and cash equivalents, end of period	22,903	64,698
Reconciliation of cash, cash equivalents, and restricted cash, beginning of period
Cash and cash equivalents	62,332	43,008
Restricted cash	5,029	5,021
Cash and cash equivalents, beginning of period	67,361	48,029
Reconciliation of cash, cash equivalents, and restricted cash, end of period
Cash and cash equivalents	17,900	59,673
Restricted cash	5,003	5,025
Cash and cash equivalents, end of period	22,903	64,698
Supplemental disclosure for cash flow information:
Cash paid for interest, net of amounts capitalized	5,080	3,627
Cash paid for income taxes	4,878	9,893
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	399	0
Property and equipment purchased and included in accounts payable	$ 223	$ 479