CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 10,757	$ 5,990
Short-term marketable securities	74,985	71,233
Accounts receivable, net	19,915	20,458
Inventories	14,988	11,142
Prepaid expenses and other current assets	1,357	1,716
Total current assets	122,002	110,539
Property and equipment, net	6,472	6,378
Intangible assets, net		115
Goodwill	36,506	36,846
Other long-term assets	29	33
Total assets	165,009	153,911
Current liabilities:
Accounts payable	6,306	6,910
Accrued expenses	13,883	12,480
Deferred revenue	3,100	3,025
Total current liabilities	23,289	22,415
Long-term deferred tax liability	5,344	4,799
Other long-term liabilities	331	400
Total liabilities	28,964	27,614
Commitments and contingencies (Note 10)
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 - 39,742,737 shares at December 31, 2012 and 39,323,708 shares at March 31, 2012; Outstanding - 38,880,393 shares at December 31, 2012 and 39,272,754 shares at March 31, 2012	397	393
Additional paid in capital	411,715	401,771
Accumulated deficit	(262,003)	(273,275)
Treasury stock at cost - 862,344 shares at December 31, 2012 and 50,954 shares at March 31, 2012	(11,719)	(827)
Accumulated other comprehensive loss	(2,345)	(1,765)
Total stockholders' equity	136,045	126,297
Total liabilities and stockholders' equity	$ 165,009	$ 153,911