CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 55,915	$ 50,305
Short-term investments	1,899	1,964
Accounts receivable, net	3,595	3,880
Inventory	567	511
Deferred cost of goods sold	152	182
Deferred tax asset	5,049	6,096
Other current assets	955	732
Total current assets	68,132	63,670
Property and equipment, net	6,636	6,673
Intangible assets, net	9,854	10,194
Goodwill	25,150	25,150
Non-current deferred tax asset	46,526	46,352
Other assets	983	572
Total assets	157,281	152,611
Current liabilities:
Accounts payable	5,500	5,644
Accrued compensation	3,711	3,629
Accrued warranty	474	452
Accrued taxes	2,104	1,912
Deferred revenue	1,609	1,236
Other accrued liabilities	905	862
Total current liabilities	14,303	13,735
Non-current liabilities	1,767	1,817
Other non-current liabilities	21	26
Total liabilities	16,091	15,578
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock	73	72
Additional paid-in capital	248,258	246,176
Accumulated other comprehensive loss	(101)	(36)
Accumulated deficit	(107,040)	(109,179)
Total stockholders' equity	141,190	137,033
Total liabilities and stockholders' equity	$ 157,281	$ 152,611