CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 56,048	$ 59,159
Short-term investments	129,519	47,181
Accounts receivable, net	7,266	5,503
Inventory	754	811
Deferred cost of goods sold	591	263
Deferred tax asset	1,732	2,065
Other current assets	2,656	1,951
Total current assets	198,566	116,933
Long-term investments	0	72,021
Property and equipment, net	9,555	7,711
Intangible assets, net	13,826	15,095
Goodwill	38,114	38,461
Non-current deferred tax asset	46,128	47,797
Other assets	1,144	1,185
Total assets	307,333	299,203
Current liabilities:
Accounts payable	8,898	6,789
Accrued compensation	5,500	4,583
Accrued warranty	538	660
Accrued taxes	2,570	2,323
Deferred revenue	1,522	1,857
Other accrued liabilities	1,321	1,909
Total current liabilities	20,349	18,121
Non-current liabilities	1,494	1,619
Non-current deferred revenue	1,038	1,285
Total liabilities	22,881	21,025
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock	89	88
Additional paid-in capital	389,755	384,325
Accumulated other comprehensive gain	(26)	430
Accumulated deficit	(105,366)	(106,665)
Total stockholders' equity	284,452	278,178
Total liabilities and stockholders' equity	$ 307,333	$ 299,203