CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of Revenue:
Product sales, net	$ 66,999	$ 65,904	$ 43,497
Research and development services and other income	252	977	753
Total revenues	67,251	66,881	44,250
Costs and Expenses:
Cost of revenues	39,879	32,194	22,935
Selling, general and administrative expenses	19,904	15,005	11,336
Product development and research expenses	19,265	17,140	13,171
Total costs and expenses	79,048	64,339	47,442
Operating (loss) income	(11,797)	2,542	(3,192)
Other Income (Expense):
Change in the fair value of derivative liability	0	0	23,144
Foreign currency exchange gain (loss)	7,719	(936)	109
Interest and other expense, net	(11,198)	(13,304)	(13,358)
(Loss) income before income tax expense	(15,276)	(11,698)	6,703
Income tax (benefit) expense	(85)	287	35
Net (loss) income attributable to common stockholders	$ (15,191)	$ (11,985)	$ 6,668
Basic (loss) earnings per share (in dollars per share)	$ (0.28)	$ (0.23)	$ 0.13
Diluted (loss) earnings per share (in dollars per share)	$ (0.28)	$ (0.23)	$ (0.07)
Weighted average shares of common stock outstanding:
Basic (in shares)	53,323,954	53,078,158	52,872,814
Diluted (in shares)	53,323,954	53,078,158	67,111,995