Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities
Net (loss)/Income	$ (19,347)	$ 7,034
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities:
Stock-based compensation	8,160	4,303
Deferred taxes	(14,100)	(2,705)
Depreciation and amortization	22,381	25,575
Acquired in-process research and development ("IPR&D")	3,753	2,324
Non-cash interest relating to convertible notes and loan cost amortization	705	3,766
Changes in operating assets and liabilities:
Accounts receivable, net	(1,033)	(11,432)
Inventories, net	4,055	(4,793)
Prepaid expenses and other current assets	878	1,204
Accounts payable	665	1,332
Accrued royalties	920	(2,191)
Current income taxes, net	9,362	(8,464)
Accrued government rebates	816	1,969
Returned goods reserve	3,408	2,104
Accrued expenses, accrued compensation, and other	1,967	(991)
Net Cash and Cash Equivalents Provided by Operating Activities	22,590	19,035
Cash Flows From Investing Activities
Acquisition of product rights, IPR&D, and other related assets	(58,130)	(20,834)
Acquisition of property and equipment, net	(2,264)	(3,409)
Net Cash and Cash Equivalents Used in Investing Activities	(60,394)	(24,243)
Cash Flows From Financing Activities
Payments on Term Loan and Delayed Draw Term Loan agreements	(3,279)	(902)
Borrowings under Revolver agreement	15,000	0
Payments on Revolver agreement	(7,500)	0
Proceeds from stock option exercised	449	4,719
Treasury stock purchases for restricted stock vests	(1,523)	(1,031)
Net Cash and Cash Equivalents Provided by Financing Activities	3,147	2,786
Change in Cash, Cash Equivalents, and Restricted Cash	(34,657)	(2,422)
Cash, cash equivalents, and restricted cash, beginning of period	67,361	48,029
Cash, cash equivalents, and restricted cash, end of period	32,704	45,607
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, cash equivalents, and restricted cash, beginning of period	67,361	48,029
Reconciliation of cash, cash equivalents, and restricted cash, end of period
Cash and cash equivalents	27,702	40,589
Restricted cash	5,002	5,018
Cash, cash equivalents, and restricted cash, end of period	32,704	45,607
Supplemental disclosure for cash flow information:
Cash paid for interest, net of amounts capitalized	3,541	2,937
Cash paid for income taxes	523	8,723
Supplemental non-cash investing and financing activities:
Property and equipment purchased and included in accounts payable	$ 161	$ 133