CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 5,092	$ 5,831
Short-term marketable securities	64,482	54,481
Accounts receivable, net	17,303	15,376
Inventories	9,688	7,505
Prepaid expenses and other current assets	1,417	1,544
Total current assets	97,982	84,737
Property and equipment, net	6,413	6,273
Intangible assets, net	459	1,632
Goodwill	35,772	38,946
Total assets	140,626	131,588
Current liabilities:
Accounts payable	5,206	6,283
Accrued expenses	10,768	14,078
Deferred revenue	1,886	1,982
Total current liabilities	17,860	22,343
Long-term deferred tax liability	4,565	4,010
Other long-term liabilities	423	492
Total liabilities	22,848	26,845
Commitments and contingencies (Note 9)
Stockholders' equity:
Class B Preferred Stock, $.01 par value Authorized - 1,000,000 shares; Issued and outstanding - none
Common stock, $.01 par value Authorized - 100,000,000 shares; Issued - 39,023,921 shares at December 31, 2011 and 37,756,719 shares at March 31, 2011; Outstanding - 38,972,967 shares at December 31, 2011 and 37,705,765 shares at March 31, 2011	390	377
Additional paid-in-capital	397,093	379,218
Accumulated deficit	(275,842)	(274,770)
Treasury stock at cost - 50,954 shares	(827)	(827)
Accumulated other comprehensive (loss) income	(3,036)	745
Total stockholders' equity	117,778	104,743
Total liabilities and stockholders' equity	$ 140,626	$ 131,588