Summary of Significant Accounting Policies (Share-Based Compensation) (Tables)

12 Months Ended

Dec. 31, 2017

Summary Of Significant Accounting Policies Share-based Compensation Tables

Stock-based employee compensation expense

The following table summarizes the amount of share-based compensation expense by line item on the Statement of Operations (in thousands):

		Year Ended December 31,
		2017		2016		2015
Cost of product revenue	$	39	$	37	$	19
Research and development expense		546		350		282
Sales, marketing, general and administrative expense		703		836		706
	$	1,288	$	1,223	$	1,007