Share-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2011

Share-Based Compensation [Abstract]

Components Of Share-Based Compensation Expense

	Three Months Ended September 30,				Six Months Ended September 30,
	2011		2010		2011		2010
Cost of product revenue	$	41	$	31	$	88	$	51
Cost of service revenue		47		70		112		130
Research and development		525		368		1,102		641
Sales and marketing		607		588		1,377		1,072
General and administrative		568		444		1,268		785
	$	1,788	$	1,501	$	3,947	$	2,679