CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 50,305	$ 22,426
Short-term investments	1,964	1,942
Accounts receivable, net	3,880	2,279
Inventory	511	581
Deferred cost of goods sold	182	122
Deferred tax asset	6,096	7,730
Other current assets	732	806
Total current assets	63,670	35,886
Property and equipment, net	6,673	3,820
Intangible assets, net	10,194	11,622
Goodwill	25,150	25,150
Non-current deferred tax asset	46,352	53,977
Other assets	572	278
Total assets	152,611	130,733
Current liabilities:
Accounts payable	5,644	5,476
Accrued compensation	3,629	3,105
Accrued warranty	452	387
Accrued taxes	1,912	1,472
Deferred revenue	1,236	891
Other accrued liabilities	862	884
Total current liabilities	13,735	12,215
Non-current liabilities	1,843	68
Total liabilities	15,578	12,283
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.001 par value: Authorized: 5,000,000 shares; Issued and outstanding: no shares at March 31, 2013 and 2012	0	0
Common stock, $0.001 par value: Authorized: 200,000,000 shares; Issued and outstanding: 72,108,980 shares and 70,679,493 shares at March 31, 2013 and 2012, respectively	72	71
Additional paid-in capital	246,176	241,555
Accumulated other comprehensive loss	(36)	(58)
Accumulated deficit	(109,179)	(123,118)
Total stockholders' equity	137,033	118,450
Total liabilities and stockholders' equity	$ 152,611	$ 130,733