Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 21,264	$ 23,386
Operating expenses:
Cost of product revenue	7,845	6,083
Research & development	5,161	4,230
Selling, general & administrative	16,090	5,067
Total operating expenses	29,096	15,380
Income (loss) from operations	(7,832)	8,006
Interest and other income, net	95	58
Income (loss) before income taxes	(7,737)	8,064
Provision for (benefit from) income taxes	(1,051)	2,571
Net income (loss)	$ (6,686)	$ 5,493
Basic net income (loss) per share:
Net income (loss) (in dollars per share)	$ (0.46)	$ 0.38
Basic weighted average common shares outstanding (in shares)	14,679	14,576
Diluted net income (loss) per share:
Net income (loss) (in dollars per share)	$ (0.46)	$ 0.37
Diluted weighted average common shares outstanding (in shares)	14,679	15,043
Net income (loss)	$ (6,686)	$ 5,493
Foreign currency translation adjustment	620	292
Comprehensive income (loss)	(6,066)	5,785
Product [Member]
Revenue	21,258	23,381
Service [Member]
Revenue	$ 6	$ 5