CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 201,420	$ 191,762	[1]
Short-term investments	8,117	8,107	[1]
Accounts receivable, net of allowances of $512 and $497 at September 30, 2011 and December 31, 2010, respectively	38,973	38,661	[1]
Inventories	16,993	18,107	[1]
Prepaid expenses	9,904	10,495	[1]
Deferred tax assets	10,352	10,352	[1]
Other current assets	6,046	6,107	[1]
Total current assets	291,805	283,591	[1]
Property and equipment, net	17,112	17,306	[1]
Non-current net investment in sales-type leases	11,361	8,785	[1]
Goodwill	28,543	28,543	[1]
Other intangible assets	4,157	4,231	[1]
Non-current deferred tax assets	11,801	11,677	[1]
Other assets	9,149	9,716	[1]
Total assets	373,928	363,849	[1]
Current liabilities:
Accounts payable	10,610	11,000	[1]
Accrued compensation	7,727	7,328	[1]
Accrued liabilities	8,253	8,901	[1]
Deferred service revenue	19,835	19,191	[1]
Deferred gross profit	15,877	14,210	[1]
Total current liabilities	62,302	60,630	[1]
Long-term deferred service revenue	19,003	18,966	[1]
Other long-term liabilities	1,733	1,339	[1]
Total liabilities	83,038	80,935	[1]
Stockholders' equity:
Total stockholders' equity	290,890	282,914	[1]
Total liabilities and stockholders' equity	$ 373,928	$ 363,849	[1]

[1] (1) Information derived from our December 31, 2011 audited Consolidated Financial Statements.