Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Cash Flows [Abstract]
Net income (loss)	$ (219)	$ 1,388
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	166	246
Amortization, impairment, and abandonment of intangibles	341	357
Stock-based compensation	720	784
Allowance (recovery) for doubtful accounts	0	(18)
Gain on sales of discontinued operations	0	(43)
Changes in operating assets and liabilities:
Accounts and other receivables	(1,475)	(247)
Inventories	(108)	(96)
Prepaid expenses and other current assets	56	3,236
Other assets	(20)	(26)
Accounts payable	1,303	268
Accrued compensation and other current liabilities	(415)	(1,413)
Deferred revenue and customer advances	1,097	258
Other long-term liabilities	343	(16)
Net cash provided by operating activities	1,789	4,678
Cash flows used in investing activities:
Purchases of available-for-sale investments	(14,979)	(14,959)
Proceeds from maturities of available-for-sale investments	15,000	15,000
Additions to intangibles	(596)	(848)
Purchases of property and equipment	(828)	(27)
Proceeds from sales of discontinued operations	0	70
Net cash used in investing activities	(1,403)	(764)
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	51	0
Exercise of stock options	852	65
Net cash provided by financing activities	903	65
Net increase in cash and cash equivalents	1,289	3,979
Cash and cash equivalents:
Beginning of the period	7,298	12,243
End of the period	8,587	16,222
Supplemental disclosure of cash flow information:
Cash paid (received) for taxes	6	(3,347)
Supplemental disclosure of non-cash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	644	347
Release of Restricted Stock Units and Awards under company stock plan	$ 780	$ 277