CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 16,178	$ 10,389	$ 4,892
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,325	7,983	8,619
Loss on disposal of fixed assets	66	0	191
Gain on legal settlement	0	0	(2,439)
Provision for (recovery of) receivable allowance	582	(155)	(575)
Gain on sale of note receivable	0	(473)	(684)
Share-based compensation expense	9,214	9,499	9,015
Income tax benefits from employee stock plans	2,527	3,597	2,001
Excess tax benefits from employee stock plans	(3,182)	(3,946)	(1,861)
Provision for excess and obsolete inventories	394	1,112	640
Foreign currency remeasurement loss	0	210	(1)
Deferred income taxes	2,718	589	2,403
Changes in operating assets and liabilities:
Accounts receivable, net	(9,311)	5,863	(1,317)
Inventories	2,536	(9,434)	77
Prepaid expenses	(4,897)	1,464	(3,179)
Other current assets	(1,114)	(594)	209
Net investment in sales-type leases	(4,154)	1,036	1,412
Other assets	(3,831)	339	519
Accounts payable	1,751	(2,242)	2,859
Accrued compensation	4,285	(403)	(529)
Accrued liabilities	674	(342)	(2,131)
Deferred service revenue	2,914	3,596	2,367
Deferred gross profit	6,562	2,491	(1,970)
Other long-term liabilities	2,247	664	80
Net cash provided by operating activities	39,484	31,243	20,598
Cash flows from investing activities:
Purchases of short-term investments	0	(8,097)	(8,059)
Maturities of short-term investments	8,122	8,143	0
Acquisition of intangible assets and intellectual property	(373)	(235)	(198)
Software development for external use	(5,028)	(4,192)	(2,207)
Purchases of property and equipment	(15,201)	(8,685)	(6,890)
Proceeds from disposal of equipment	81	0	0
Business acquisition, net of cash acquired	(156,312)	0	(5,703)
Net cash used in investing activities	(168,711)	(13,066)	(23,057)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock purchase and stock option plans	8,949	6,787	7,002
Stock repurchases	(12,363)	(12,573)	0
Excess tax benefits from employee stock plans	3,182	3,946	1,861
Net cash provided from (used in) financing activities	(232)	(1,840)	8,863
Effect of exchange rate changes on cash and cash equivalents	10	(210)	1
Net (decrease) increase in cash and cash equivalents	(129,449)	16,127	6,405
Cash and cash equivalents at beginning of period	191,762	175,635	169,230
Cash and cash equivalents at end of period	62,313	191,762	175,635
Supplemental disclosure of cash flow information:
Cash paid for interest	28	62	4
Cash paid for taxes	6,676	253	1,513
Accrual of indemnification asset/acquired legal contingency	0	0	200
Satisfaction of acquired legal contingency with indemnification asset	$ 0	$ (1,200)	$ 0