CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 36,274	$ 22,426
Short-term investments	1,968	1,942
Accounts receivable, net	2,837	2,279
Inventory	593	581
Deferred cost of goods sold	136	122
Deferred tax asset	1,952	7,730
Other current assets	810	806
Total current assets	44,570	35,886
Property and equipment, net	5,240	3,820
Intangible assets, net	11,265	11,622
Goodwill	25,150	25,150
Non-current deferred tax asset	53,977	53,977
Other assets	422	278
Total assets	140,624	130,733
Current liabilities:
Accounts payable	6,375	5,476
Accrued compensation	3,083	3,105
Accrued warranty	405	387
Accrued taxes	1,584	1,472
Deferred revenue	708	891
Other accrued liabilities	825	884
Total current liabilities	12,980	12,215
Non-current liabilities	39	68
Total liabilities	13,019	12,283
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock	71	71
Additional paid-in capital	242,067	241,555
Accumulated other comprehensive loss	(32)	(58)
Accumulated deficit	(114,501)	(123,118)
Total stockholders' equity	127,605	118,450
Total liabilities and stockholders' equity	$ 140,624	$ 130,733