CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 35,368	$ 43,471
Short-term investments	22,366	25,981
Receivables (net of allowances of $254 at December 31, 2011 and $320 at March 31, 2011)	26,041	27,880
Inventories	19,852	19,814
Prepaid expenses and other current assets	5,600	3,496
Net deferred tax assets, current	3,166	3,422
Total current assets	112,393	124,064
Long-term investments	30,189	36,237
Investment in unconsolidated affiliate	2,668	2,769
Property and equipment, net	23,448	19,637
Intangible assets, net	4,148	4,216
Net deferred tax assets, non-current	1,080	1,203
Other assets	106	134
Total assets	174,032	188,260
Current liabilities:
Accounts payable	6,245	6,173
Accrued payroll and related expenses	5,747	6,129
Accrued taxes	0	559
Other accrued liabilities	2,072	1,677
Deferred revenue	1,138	953
Warranty reserve	1,123	1,031
Total current liabilities	16,325	16,522
Non-current liabilities:
Deferred rent	597	416
Deferred revenue	2,285	1,737
Warranty reserve	482	191
Notes payable, less current portion	808	746
Total non-current liabilities	4,172	3,090
Total liabilities	20,497	19,612
Commitments and contingencies (Note 9)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, no par value: 35,000,000 shares authorized; 21,688,000 and 22,587,000 shares issued and outstanding at December 31, 2011 and at March 31, 2011, respectively	108,558	132,042
Retained earnings	44,991	36,606
Accumulated other comprehensive loss	(14)	0
Total shareholders' equity	153,535	168,648
Total liabilities and shareholders' equity	$ 174,032	$ 188,260