CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 38,108	$ 22,426
Short-term investments	2,009	1,942
Accounts receivable, net	4,153	2,279
Inventory	571	581
Deferred cost of goods sold	125	122
Deferred tax asset	1,151	7,730
Other current assets	933	806
Total current assets	47,050	35,886
Property and equipment, net	7,225	3,820
Intangible assets, net	10,908	11,622
Goodwill	25,150	25,150
Non-current deferred tax asset	53,977	53,977
Other assets	409	278
Total assets	144,719	130,733
Current liabilities:
Accounts payable	5,065	5,476
Accrued compensation	3,047	3,105
Accrued warranty	376	387
Accrued taxes	1,677	1,472
Deferred revenue	985	891
Other accrued liabilities	761	884
Total current liabilities	11,911	12,215
Non-current liabilities	1,820	68
Total liabilities	13,731	12,283
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock	72	71
Additional paid-in capital	243,667	241,555
Accumulated other comprehensive income (loss)	9	(58)
Accumulated deficit	(112,760)	(123,118)
Total stockholders' equity	130,988	118,450
Total liabilities and stockholders' equity	$ 144,719	$ 130,733