CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income	$ 10,389	$ 4,892	$ 444
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,983	8,619	9,428
Loss on disposal of fixed assets		191	267
Gain on legal settlement		(2,439)
(Recovery of) provision for receivable allowance	(155)	(575)	428
Gain on sale of note receivable	(473)	(684)
Share-based compensation expense	9,499	9,015	9,725
Income tax benefits (charges) from employee stock plans	3,597	2,001	(5,464)
Excess tax benefits from employee stock plans	(3,946)	(1,861)	(5,375)
Provision for excess and obsolete inventories	1,112	640	3,119
Foreign currency remeasurement loss (gain)	210	(1)	102
Deferred tax assets and liabilities	589	2,403	5,847
Changes in operating assets and liabilities, net of effect of acquired company
Accounts receivable	5,863	(1,317)	17,190
Inventories	(9,434)	77	(693)
Prepaid expenses	1,464	(3,179)	531
Other current assets	(594)	209	3,772
Net investment in sales-type leases	1,036	1,412	(446)
Other assets	339	519	243
Accounts payable	(2,242)	2,859	936
Accrued compensation	(403)	(529)	(794)
Accrued liabilities	(342)	(2,131)	1,640
Deferred service revenue	3,596	2,367	7,945
Deferred gross profit	2,491	(1,970)	(2,320)
Other long-term liabilities	664	80	(254)
Net cash provided by operating activities	31,243	20,598	46,271
Cash flows from investing activities
Purchases of short-term investments	(8,097)	(8,059)
Maturities of short-term investments	8,143
Acquisition of intangible assets and intellectual property	(235)	(198)	(111)
Software development for external use	(4,192)	(2,207)	(3,039)
Purchases of property and equipment	(8,685)	(6,890)	(3,645)
Business acquisition, net of cash acquired		(5,703)
Net cash used in investing activities	(13,066)	(23,057)	(6,795)
Cash flows from financing activities
Proceeds from issuance of common stock under employee stock purchase plan and option exercises	6,787	7,002	4,042
Stock repurchases	(12,573)
Excess tax benefits from employee stock plans	3,946	1,861	5,375
Net cash (used in) provided by financing activities	(1,840)	8,863	9,417
Effect of exchange rate changes on cash and cash equivalents	(210)	1	(102)
Net increase in cash and cash equivalents	16,127	6,405	48,791
Cash and cash equivalents at beginning of year	175,635	169,230	120,439
Cash and cash equivalents at end of year	191,762	175,635	169,230
Supplemental disclosures of cash flow informational
Cash paid for interest	62	4	11
Cash paid for taxes	253	1,513	320
Supplemental disclosures of non-cash operating activity
Accrual of indemnification asset/acquired legal contingency (Note 2)		200
Satisfaction of acquired legal contingency with indemnification asset (Note 2)	$ (1,200)