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 (loss)	$ 78	$ (2,474)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization of property and equipment	485	583
Amortization and impairment or abandonment of intangibles	692	439
Stock-based compensation	1,765	1,533
Allowance (recovery) for doubtful accounts	(20)	(82)
Loss on disposal of equipment	3	79
Loss on divestiture	0	42
Gain on sales of discontinued operations	(61)	(61)
Changes in operating assets and liabilities:
Accounts and other receivables	(464)	1,101
Inventories	(42)	595
Prepaid expenses and other current assets	3,204	348
Other assets	(54)	0
Accounts payable	250	532
Accrued compensation and other current liabilities	(1,602)	(1,230)
Deferred revenue and customer advances	(1,071)	(1,371)
Other long-term liabilities	(33)	116
Net cash provided by operating activities	3,130	150
Cash flows used in investing activities:
Purchases of available-for-sale investments	(29,927)	(29,965)
Proceeds from maturities of available-for-sale investments	30,000	25,000
Net proceeds from divestiture	0	964
Additions to intangibles	(1,522)	(981)
Proceeds from sale of property and equipment	0	160
Purchases of property and equipment	(39)	(289)
Proceeds from sales of discontinued operations	100	60
Net cash used in investing activities	(1,388)	(5,051)
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	65	0
Exercise of stock options	1,849	60
Net cash provided by financing activities	1,914	60
Net increase in cash and cash equivalents	3,656	(4,841)
Cash and cash equivalents:
Beginning of the period	12,243	19,828
End of the period	15,899	14,987
Supplemental disclosure of cash flow information:
Cash paid (received) for taxes	(3,320)	6
Supplemental disclosure of non-cash investing and financing activities:
Amounts accrued for property and equipment, and intangibles	630	279
Shares issued under company stock plan	$ 1,257	$ 428