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 loss	$ (5,564)	$ (1,604)	$ (5,927)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	654	1,128	1,095
Amortization, impairment, or abandonment of intangibles	1,554	1,394	1,237
Stock-based compensation	3,146	3,555	3,409
Allowance (recovery) for doubtful accounts	113	(22)	(40)
Loss on disposal of equipment	27	(6)	90
Loss on divestiture	0	0	43
Gain on sales of discontinued operations	(153)	(61)	(130)
Changes in operating assets and liabilities:
Accounts and other receivables	(504)	(567)	2,213
Inventories	282	(17)	713
Deferred income taxes	0	0	(94)
Prepaid expenses and other current assets	(227)	3,342	651
Other assets	(54)	(116)	(299)
Accounts payable	(18)	(24)	(902)
Accrued compensation and other current liabilities	(685)	(785)	348
Deferred revenue and customer advances	(3,194)	(3,574)	(4,394)
Other long-term liabilities	374	(266)	188
Net cash provided by (used in) operating activities	(4,249)	2,377	(1,799)
Cash flows provided by (used in) investing activities:
Purchases of available-for-sale investments	(43,944)	(48,905)	(48,854)
Proceeds from maturities of available-for-sale investments	54,000	49,000	44,000
Net proceeds from divestiture	0	0	964
Additions to intangibles	(3,244)	(3,336)	(2,321)
Proceeds from the sale of property and equipment	0	0	160
Purchases of property and equipment	(1,000)	(169)	(345)
Proceeds from sales of discontinued operations	250	100	192
Net cash provided by (used in) investing activities	6,062	(3,310)	(6,204)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	122	145	0
Exercise of stock options	1,046	2,293	427
Purchases of treasury stock	(5,721)	(6,450)	(9)
Net cash provided by (used in) financing activities	(4,553)	(4,012)	418
Net decrease in cash and cash equivalents	(2,740)	(4,945)	(7,585)
Cash and cash equivalents:
Beginning of year	7,298	12,243	19,828
End of year	4,558	7,298	12,243
Supplemental disclosure of cash flow information:
Cash paid (received) for taxes	21	(3,302)	(34)
Supplemental disclosure of noncash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	442	1,222	618
Issuance of shares from Employee Stock Purchase Plan and Release of Restricted Stock Units and Awards under company stock plan	$ 1,298	$ 1,323	$ 469