CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net loss	$ (18,640)	$ (18,067)	$ (14,577)
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on the sale of discontinued operations, net of tax	0	0	(4,190)
Depreciation	438	323	613
Write-off of fixed assets	0	0	323
Loss on cumulative translation adjustment on discontinued operations	284	0	0
Stock-based compensation expense	3,769	3,331	3,690
Amortization of premiums and discounts on marketable securities	1,451	1,149	249
Amortization of intangible assets	866	364	177
Amortization of purchased technology	83	83	172
Realized gain on investments	(7)	(1,299)	(5,859)
Loss on auction-rate security put option	0	1,289	5,859
Changes in assets and liabilities:
Accounts receivable, net	(5,146)	(1,943)	2,494
Prepaid expenses and other current assets	544	(371)	103
Other assets	(192)	(318)	132
Accounts payable	658	436	(843)
Accrued compensation	402	491	(970)
Other accrued liabilities	885	510	(9,981)
Other long-term liabilities	340	(214)	(294)
Deferred revenue	3,147	848	(1,068)
Net cash used in operating activities	(11,118)	(13,388)	(23,970)
Investing activities:
Proceeds from sale of discontinued operations	0	0	20,475
Purchases of property and equipment	(279)	(498)	(234)
Purchase of developed technology	0	0	(350)
Acquisition of business, net of cash acquired	(8,419)	0	(7,942)
Purchases of investments	(50,763)	(65,464)	(44,932)
Sales of investments	23,263	33,073	2,630
Maturities of investments	50,691	36,733	13,050
Net cash provided by (used in) investing activities	14,493	3,844	(17,303)
Financing activities:
Proceeds from issuances of common stock	516	4,539	485
Net cash provided by financing activities	516	4,539	485
Net increase (decrease) in cash and cash equivalents	3,891	(5,005)	(40,788)
Effect of exchange rate changes on cash and cash equivalents	(293)	19	29
Cash and cash equivalents at beginning of period	18,561	23,547	64,306
Cash and cash equivalents at end of period	22,159	18,561	23,547
Supplemental schedule of cash flow information:
Cash paid for (refund of) income taxes	$ (89)	$ 89	$ 311