CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Revenue:
Revenue, net	$ 65,865	$ 60,202	$ 63,012
Costs and Expenses:
Cost of revenues	43,480	32,830	28,325
Selling, general and administrative expenses	23,408	19,904	15,005
Product development and research expenses	14,076	19,265	17,140
Total costs and expenses	80,964	71,999	60,470
Operating (loss) income	(15,099)	(11,797)	2,542
Other (Expense) Income:
Foreign currency exchange (loss) gain	(3,371)	7,719	(936)
Debt partial extinguishment of 2019 Notes	(4,235)	0	0
Debt extinguishment of 2021 Term Loan	(1,315)	0	0
Interest and other expense, net	(12,298)	(11,198)	(13,304)
Loss before income tax expense	(36,318)	(15,276)	(11,698)
Income tax (benefit) expense	(62)	(85)	287
Net loss attributable to common stockholders	$ (36,256)	$ (15,191)	$ (11,985)
Basic and diluted loss per share (in dollars per share)	$ (0.68)	$ (0.28)	$ (0.23)
Weighted average shares of common stock outstanding:
Basic and diluted (in shares)	53,592,930	53,323,954	53,078,158