Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Revenue	$ 69,680	$ 62,884
Cost of products sold	18,051	16,082
Gross profit	51,629	46,802
Operating expenses:
Selling, general and administrative	45,656	40,789
Research, development and other technology	17,850	16,337
Acquisition transaction, integration and legal costs	187	292
Intangible asset amortization	2,919	3,203
Contingent consideration expense	0	100
Total operating expenses	66,612	60,721
Operating loss	(14,983)	(13,919)
Other expense:
Interest expense	(3,409)	(3,342)
Foreign currency transaction gain (loss)	117	175
Total other expense	(3,292)	(3,167)
Loss before income tax expense	(18,275)	(17,086)
Income tax expense	249	205
Net loss	$ (18,524)	$ (17,291)
Net loss per share —
Basic and diluted (in dollars per share)	$ (0.43)	$ (0.40)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	$ 183	$ 251
Comprehensive loss, net of tax	$ (18,341)	$ (17,040)
Weighted average common shares outstanding —
Basic and diluted (in shares)	43,491,183	42,697,323