Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net loss	$ (1,334)	$ (3,607)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	717	842
Amortization and impairment or abandonment of intangibles	1,016	650
Stock-based compensation	2,705	2,430
Allowance for doubtful accounts	(25)	(120)
Loss on disposal of equipment	3	90
Loss on divestiture	0	43
Gain on sales of discontinued operations	(61)	(143)
Changes in operating assets and liabilities:
Accounts and other receivables	61	2,259
Inventories	(173)	860
Prepaid expenses and other current assets	3,117	53
Other assets	(89)	0
Accounts payable	32	(315)
Accrued compensation and other current liabilities	(1,282)	(829)
Deferred revenue and customer advances	(2,454)	(3,583)
Other long-term liabilities	(56)	121
Net cash provided by (used in) operating activities	2,177	(1,249)
Cash flows used in investing activities:
Purchases of available-for-sale investments	(44,910)	(34,880)
Proceeds from maturities of available-for-sale investments	45,000	30,000
Net proceeds from divestiture	0	964
Additions to intangibles	(2,406)	(1,584)
Proceeds from sale of property and equipment	0	160
Purchases of property and equipment	(84)	(336)
Proceeds from sales of discontinued operations	100	142
Net cash used in investing activities	(2,300)	(5,534)
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	145	0
Exercise of stock options	2,244	83
Net cash provided by financing activities	2,389	83
Net increase in cash and cash equivalents	2,266	(6,700)
Cash and cash equivalents:
Beginning of the period	12,243	19,828
End of the period	14,509	13,128
Supplemental disclosure of cash flow information:
Cash paid (received) for taxes	(3,302)	6
Supplemental disclosure of non-cash investing and financing activities:
Amounts accrued for property and equipment, and intangibles	636	377
Shares issued under company stock plan	$ 1,305	$ 34