Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net loss	$ (1,604)	$ (5,927)	$ (28,279)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	1,128	1,095	1,563
Amortization and impairment or abandonment of intangibles	1,394	1,237	894
Stock-based compensation	3,555	3,409	4,524
Change in fair value of warrant liability	0	0	(517)
Allowance (recovery) for doubtful accounts	(22)	(40)	(229)
Loss on disposal of equipment	(6)	90	726
Loss on divestiture	0	43	0
Gain on sales of discontinued operations	(61)	(129)	(237)
Changes in operating assets and liabilities:
Accounts and other receivables	(567)	2,213	3,355
Inventories	(17)	713	1,395
Deferred income taxes	0	(94)	63
Prepaid expenses and other current assets	3,342	651	(131)
Other assets	(116)	(300)	11
Accounts payable	(24)	(902)	(1,441)
Accrued compensation and other current liabilities	(713)	333	(1,702)
Income taxes payable	(72)	15	4
Deferred revenue and customer advances	(3,574)	(4,394)	1,398
Other long-term liabilities	(266)	188	285
Net cash provided by (used in) operating activities	2,377	(1,799)	(18,318)
Cash flows used in investing activities:
Purchases of available-for-sale investments	(48,905)	(48,854)	(97,980)
Proceeds from maturities of available-for-sale investments	49,000	44,000	75,000
Net proceeds from divestiture	0	964	0
Additions to intangibles	(3,336)	(2,321)	(2,589)
Proceeds from the sale of property and equipment	0	160	0
Purchases of property and equipment	(169)	(345)	(1,569)
Proceeds from sales of discontinued operations	100	192	237
Net cash used in investing activities	(3,310)	(6,204)	(26,901)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	145	0	134
Exercise of stock options	2,293	427	144
Purchases of treasury stock	(6,450)	(9)	0
Net cash provided by (used in) financing activities	(4,012)	418	278
Net decrease in cash and cash equivalents	(4,945)	(7,585)	(44,941)
Cash and cash equivalents:
Beginning of year	12,243	19,828	64,769
End of year	7,298	12,243	19,828
Supplemental disclosure of cash flow information:
Cash paid (received) for taxes	(3,302)	(34)	(54)
Supplemental disclosure of noncash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	1,222	618	351
Release of Restricted Stock Units and Awards under company stock plan	$ 1,323	$ 469	$ 64