CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 20,004	$ 16,474
Restricted cash	28	0
Short-term investments	1,912	1,927
Accounts receivable, net	1,917	863
Inventory	539	2,105
Deferred cost of goods sold	129	123
Other current assets	819	584
Total current assets	25,348	22,076
Property and equipment, net	3,483	2,398
Intangible assets, net	11,979	214
Goodwill	25,150	1,210
Other assets	647	686
Total assets	66,607	26,584
Current liabilities:
Accounts payable	4,481	4,551
Accrued compensation	3,296	1,722
Accrued warranty	396	362
Accrued taxes	1,432	1,828
Deferred revenue	1,013	835
Other accrued liabilities	1,732	1,386
Total current liabilities	12,350	10,684
Other liabilities	400	39
Total liabilities	12,750	10,723
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock	62	62
Additional paid-in capital	240,864	208,218
Accumulated other comprehensive loss	(88)	(73)
Accumulated deficit	(186,981)	(192,346)
Total stockholders' equity	53,857	15,861
Total liabilities and stockholders' equity	$ 66,607	$ 26,584