CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
ASSETS.
Cash and cash equivalents	$ 41,520	$ 41,120
Short-term investments	39,412	26,139
Accounts receivable, net	8,238	10,241
Inventories	8,185	13,809
Prepaid expenses and other current assets	5,152	4,945
Deferred income taxes		1,224
Total current assets	102,507	97,478
Property and equipment, net	9,683	10,774
Long-term investment	28,819	35,495
Other assets	668	2,098
Total assets	141,677	145,845
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	4,870	3,804
Accrued expenses and other liabilities	4,444	3,978
Deferred revenue	2,523	3,077
Total current liabilities	11,837	10,859
Income taxes payable	1,462	2,803
Total liabilities	13,299	13,662
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock: $0.001 par value authorized: 5,000,000 shares; issued and outstanding: none
Common Stock: $0.001 par value authorized: 150,000,000 shares; issued and outstanding: 27,561,482 and 27,065,209 shares, respectively	28	27
Additional paid-in capital	56,399	54,004
Accumulated other comprehensive income	33	45
Retained earnings	71,918	78,107
Total stockholders' equity	128,378	132,183
Total liabilities and stockholders' equity	$ 141,677	$ 145,845