Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net loss	$ (1,280)	$ (4,370)
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Loss from sale of discontinued operations	7,674
Loss from discontinued operations	2,253	2,941
Stock-based compensation	4,488	8,778
Warrant-related stock-based compensation	1,932
Depreciation and amortization of intangible assets	6,190	12,503
Earn-out contingent liability adjustments	2,000
Gain on resolution of contingent liability	(1,500)
Excess tax benefits from stock-based award activity		(141)
Amortization of premium on investments, net	285	1,271
Loss on disposals of assets	16	1,180
Other	(22)	(19)
Cash provided (used) by changes in operating assets and liabilities:
Accounts receivable	(882)	12,091
Other receivables	(1,118)	(1,107)
Prepaid expenses and other current assets	849	617
Other long-term assets	(150)	251
Accounts payable	5,981	(3,582)
Accrued expenses and other current and long-term liabilities	(13,660)	(4,418)
Net cash provided by operating activities of continuing operations	13,056	25,995
Investing activities:
Purchases of property and equipment	(2,507)	(1,576)
Other long-term assets	409
Business acquisition, net of cash acquired		(8,000)
Proceeds from the sales of assets		307
Proceeds from sales of investments		52,722
Proceeds from maturities of investments	83,141	156,005
Purchases of investments	(204,777)	(159,091)
Net cash provided (used) by investing activities of continuing operations	(123,734)	40,367
Financing activities:
Proceeds from stock option exercises and issuance of stock through employee stock purchase plan	16,664	2,236
Proceeds from the sale of common stock	7,000
Tax payments from shares withheld upon vesting of restricted stock units	(1,388)	(2,891)
Earn-out payments for business acquisition	(423)
Repayment of capital lease obligation	(221)	(439)
Excess tax benefits from stock-based award activity		141
Net cash provided (used) by financing activities of continuing operations	21,632	(953)
Discontinued operations:
Net cash used by operating activities of discontinued operations	(6,156)	(5,117)
Net cash used by investing activities of discontinued operations	(638)	(8,007)
Net cash used by discontinued operations	(6,794)	(13,124)
Net increase (decrease) in cash and cash equivalents	(95,840)	52,285
Cash and cash equivalents:
Beginning of period	155,645	83,750
End of period	59,805	136,035
Non-cash items:
Liabilities assumed in purchase transaction		(8,231)
Supplemental disclosure of non-cash financing activities:
Contingent earn-out consideration from acquisition		$ (5,000)