CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 44,557	$ 22,426
Short-term investments	1,965	1,942
Accounts receivable, net	3,605	2,279
Inventory	573	581
Deferred cost of goods sold	140	122
Deferred tax asset	284	7,730
Other current assets	736	806
Total current assets	51,860	35,886
Property and equipment, net	6,922	3,820
Intangible assets, net	10,551	11,622
Goodwill	25,150	25,150
Non-current deferred tax asset	54,065	53,977
Other assets	395	278
Total assets	148,943	130,733
Current liabilities:
Accounts payable	5,170	5,476
Accrued compensation	3,768	3,105
Accrued warranty	422	387
Accrued taxes	1,967	1,472
Deferred revenue	952	891
Other accrued liabilities	791	884
Total current liabilities	13,070	12,215
Non-current liabilities	1,894	68
Total liabilities	14,964	12,283
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock	72	71
Additional paid-in capital	244,782	241,555
Accumulated other comprehensive income (loss)	(35)	(58)
Accumulated deficit	(110,840)	(123,118)
Total stockholders' equity	133,979	118,450
Total liabilities and stockholders' equity	$ 148,943	$ 130,733