Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (9,674)	$ (33,854)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,234	3,036
Share-based compensation expense	3,154	1,843
Revenue adjustment for contingently issuable shares	(1,331)	(17)
Intangible asset impairment	8,045
Other	(1)	164
Changes in operating assets and liabilities:
Receivables from related party	(6,679)	(321)
Other assets	(141)	(2,354)
Accounts payable	(205)	(882)
Accrued expenses and other current liabilities	2,749	(4,130)
Deferred revenue	(36,068)	(1,967)
Deferred revenue, related party	(21,587)	(2,343)
Other liabilities	(998)	(780)
Net cash used in operating activities	(60,502)	(41,605)
Cash flows from investing activities:
Purchases of property and equipment	(834)	(752)
Increase in restricted cash	(942)
Net cash used in investing activities	(1,776)	(752)
Cash flows from financing activities:
Proceeds from exercise of common stock options	5,148	685
Proceeds from issuance of common stock to related party	291	5,056
Proceeds from issuance of common stock, net of offering costs	190,505	55,169
Net cash provided by financing activities	195,944	60,910
Effect of changes in exchange rates on cash and cash equivalents	(63)	25
Net increase in cash and cash equivalents	133,603	18,578
Cash and cash equivalents at beginning of period	118,271	46,115
Cash and cash equivalents at end of period	251,874	64,693
Supplemental disclosure of cash flow information:
Change in value of shares of common stock contingently issuable or issued to related party	$ (520)	$ (120)