CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,497	$ 5,990
Short-term marketable securities	84,484	71,233
Accounts receivable, net	18,801	20,458
Inventories	14,461	11,142
Prepaid expenses and other current assets	1,791	1,716
Total current assets	124,034	110,539
Property and equipment, net	6,268	6,378
Intangible assets, net		115
Goodwill	35,512	36,846
Other long-term assets	32	33
Total assets	165,846	153,911
Current liabilities:
Accounts payable	5,211	6,910
Accrued expenses	11,596	12,480
Deferred revenue	2,896	3,025
Total current liabilities	19,703	22,415
Long-term deferred tax liability	5,117	4,799
Other long-term liabilities	354	400
Total liabilities	25,174	27,614
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 - 39,717,551 shares at September 30, 2012 and 39,323,708 shares at March 31, 2012; Outstanding - 39,655,207 shares at September 30, 2012 and 39,272,754 shares at March 31, 2012	397	393
Additional paid in capital	409,519	401,771
Accumulated deficit	(264,687)	(273,275)
Treasury stock at cost - 62,344 shares at September 30, 2012 and 50,954 shares at March 31, 2012	(1,065)	(827)
Accumulated other comprehensive loss	(3,492)	(1,765)
Total stockholders' equity	140,672	126,297
Total liabilities and stockholders' equity	$ 165,846	$ 153,911