CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 59,345	$ 50,305
Short-term investments	1,909	1,964
Accounts receivable, net	4,686	3,880
Inventory	403	511
Deferred cost of goods sold	188	182
Deferred tax asset	3,870	6,096
Other current assets	4,108	732
Total current assets	74,509	63,670
Property and equipment, net	6,335	6,673
Intangible assets, net	9,523	10,194
Goodwill	23,939	25,150
Non-current deferred tax asset	46,526	46,352
Other assets	1,066	572
Total assets	161,898	152,611
Current liabilities:
Accounts payable	5,908	5,644
Accrued compensation	3,646	3,629
Accrued warranty	552	452
Accrued taxes	1,746	1,912
Deferred revenue	2,197	1,236
Other accrued liabilities	796	862
Total current liabilities	14,845	13,735
Non-current liabilities	1,717	1,817
Other non-current liabilities	16	26
Total liabilities	16,578	15,578
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock	73	72
Additional paid-in capital	250,147	246,176
Accumulated other comprehensive loss	(91)	(36)
Accumulated deficit	(104,809)	(109,179)
Total stockholders' equity	145,320	137,033
Total liabilities and stockholders' equity	$ 161,898	$ 152,611