Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities
Net Income	$ 7,034	$ 5,027
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities:
Stock-based compensation	4,303	3,159
Deferred taxes	(2,705)	(987)
Depreciation and amortization	25,575	16,508
Acquired in-process research and development ("IPR&D")	2,324	1,335
Non-cash interest relating to convertible notes and loan cost amortization	3,766	4,237
Changes in operating assets and liabilities:
Accounts receivable, net	(11,432)	2,673
Inventories, net	(4,793)	171
Prepaid expenses and other current assets	1,204	1,106
Accounts payable	1,332	4,571
Accrued royalties	(2,191)	(3,945)
Current income taxes, net	(8,464)	(572)
Accrued government rebates	1,969	(2,674)
Returned goods reserve	2,104	1,490
Accrued expenses, accrued compensation, and other	(991)	(576)
Net Cash and Cash Equivalents Provided by Operating Activities	19,035	31,523
Cash Flows From Investing Activities
Acquisition of product rights, IPR&D, and other related assets	(20,834)	(5,169)
Acquisition of property and equipment, net	(3,409)	(3,364)
Net Cash and Cash Equivalents Used in Investing Activities	(24,243)	(8,533)
Cash Flows From Financing Activities
Payment of debt issuance costs	0	(153)
Payments on term loan agreement	(902)	(938)
Proceeds from stock option exercises	4,719	2,611
Treasury stock purchases for restricted stock vestings	(1,031)	(659)
Net Cash and Cash Equivalents Provided by Financing Activities	2,786	861
Change in Cash, Cash Equivalents, and Restricted Cash	(2,422)	23,851
Cash, cash equivalents, and restricted cash, beginning of period	48,029	36,150
Cash, cash equivalents, and restricted cash, end of period	45,607	60,001
Reconciliation of cash, cash equivalents, and restricted cash, beginning of period
Cash and cash equivalents	43,008	31,144
Restricted cash	5,021	5,006
Cash, cash equivalents, and restricted cash, beginning of period	48,029	36,150
Reconciliation of cash, cash equivalents, and restricted cash, end of period
Cash and cash equivalents	40,589	54,994
Restricted cash	5,018	5,007
Cash, cash equivalents, and restricted cash, end of period	45,607	60,001
Supplemental disclosure for cash flow information:
Cash paid for interest, net of amounts capitalized	2,937	3,179
Cash paid for income taxes	8,723	2,895
Supplemental non-cash investing and financing activities:
Property and equipment purchased and included in accounts payable	$ 133	$ 233