CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 91,313	$ 74,607
Operating expenses:
Cost of goods sold	27,303	22,885
Research and development	14,384	14,378
Selling, general and administrative	48,518	44,191
Product discontinuation	29	90
Total operating expenses	90,234	81,544
Income (loss) from operations	1,079	(6,937)
Other (expense) income:
Interest income	2,156	1,374
Interest expense	(5,814)	(5,157)
Other, net	61	75
Total other expense, net	(3,597)	(3,708)
Income (loss) before income taxes	(2,518)	(10,645)
Income tax expense	(253)	(35)
Net loss	$ (2,771)	$ (10,680)
Net income (loss) per share:
Basic and diluted net loss per common share (in USD per share)	$ (0.07)	$ (0.26)
Weighted average common shares outstanding:
Basic (in shares)	41,240	40,707
Product [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 90,906	$ 74,287
Royalty [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 407	$ 320