CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 3,257	$ 2,944
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,794	4,302
Provision for receivable allowance	(43)	(117)
Share-based compensation expense	4,843	4,254
Income tax benefits from employee stock plans	2,303	2,281
Excess tax benefits from employee stock plans	(2,517)	(2,650)
Provision for excess and obsolete inventories	865	829
Deferred income taxes	(491)	(605)
Changes in operating assets and liabilities:
Accounts receivable, net	(384)	2,703
Inventories	(8,462)	(62)
Prepaid expenses	1,391	830
Other current assets	(288)	466
Net investment in sales-type leases	710	(140)
Other assets	215	156
Accounts payable	1,138	(344)
Accrued compensation	391	(2,069)
Accrued liabilities	(1,260)	1,118
Deferred service revenue	2,278	464
Deferred gross profit	(419)	(835)
Other long-term liabilities	(50)	62
Net cash provided by operating activities	7,271	13,587
Cash flows from investing activities:
Maturities of short-term investments	8,143
Acquisition of intangible assets and intellectual property	(69)	(139)
Software development for external use	(3,088)	(1,451)
Purchases of property and equipment	(4,764)	(3,380)
Net cash provided by (used in) investing activities	222	(4,970)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock purchase and stock option plans	3,613	4,659
Stock repurchases	(8,000)
Excess tax benefits from employee stock plans	2,517	2,650
Net cash (used in) provided by financing activities	(1,870)	7,309
Net increase in cash and cash equivalents	5,623	15,926
Cash and cash equivalents at beginning of period	175,635	169,230
Cash and cash equivalents at end of period	181,258	185,156
Supplemental disclosure of non-cash operating activity
Satisfaction of acquired legal contingency with indemnification asset (Note 2)	$ (1,200)