CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 191,762	$ 175,635
Short-term investments	8,107	8,074
Accounts receivable, net of allowances of $443 and $497 at December 31, 2011 and 2010, respectively	36,902	42,732
Inventories	18,107	9,785
Prepaid expenses	10,495	11,959
Deferred tax assets	10,352	9,174
Other current assets	6,107	7,266
Total current assets	281,832	264,625
Property and equipment, net	17,306	14,351
Non-current net investment in sales-type leases	8,785	9,224
Goodwill	28,543	28,543
Other intangible assets	4,231	4,672
Non-current deferred tax assets	11,677	13,444
Other assets	9,716	8,365
Total assets	362,090	343,224
Current liabilities:
Accounts payable	11,000	13,242
Accrued compensation	7,328	7,731
Accrued liabilities	7,142	8,684
Deferred service revenue	19,191	16,788
Deferred gross profit	14,210	11,719
Total current liabilities	58,871	58,164
Long-term deferred service revenue	18,966	19,171
Other long-term liabilities	1,339	675
Total liabilities	79,176	78,010
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued
Common stock, $0.001 par value; 100,000,000 shares authorized; 38,235,745 and 33,181,937 shares issued and outstanding, respectively, at December 31, 2011 and 37,148,706 and 33,027,583 shares issued and outstanding, respectively, at December 31 2010	38	37
Treasury stock, at cost, outstanding: 5,053,808 and 4,121,123 shares at December 31, 2011 and 2010, respectively	(77,637)	(65,064)
Additional paid-in capital	362,154	342,272
Accumulated deficit	(1,642)	(12,031)
Accumulated other comprehensive income	1
Total stockholders' equity	282,914	265,214
Total liabilities and stockholders' equity	$ 362,090	$ 343,224