CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 84,269	$ 54,910
Short-term investments	17,561	23,354
Receivables (net of allowances of $203 at December 31, 2013 and $319 at March 31, 2013)	28,450	40,005
Inventories	29,372	26,786
Prepaid expenses and other current assets	4,211	3,319
Net deferred tax assets, current	5,145	4,589
Total current assets	169,008	152,963
Long-term investments	10,545	17,000
Investment in unconsolidated affiliate	2,679	2,613
Property and equipment, net	26,035	25,330
Intangible assets, net	1,998	3,122
Net deferred tax assets, non-current	535	643
Other assets	81	92
Total assets	210,881	201,763
Current liabilities:
Accounts payable	6,611	8,123
Accrued payroll and related expenses	5,941	6,261
Accrued taxes	535	440
Other accrued liabilities	2,438	2,838
Deferred revenue	1,319	1,362
Warranty reserve	1,101	995
Total current liabilities	17,945	20,019
Non-current liabilities:
Deferred rent	762	729
Deferred revenue	4,177	3,750
Warranty reserve	777	389
Notes payable, less current portion	606	682
Total non-current liabilities	6,322	5,550
Total liabilities	24,267	25,569
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; 22,245,000 and 22,120,000 shares issued and outstanding at December 31, 2013 and at March 31, 2013, respectively	121,007	121,019
Retained earnings	65,580	55,133
Accumulated other comprehensive income	27	42
Total shareholders' equity	186,614	176,194
Total liabilities and shareholders' equity	$ 210,881	$ 201,763