CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 119,575	$ 143,510	[1]
Restricted cash	5,600	0	[1]
Short-term marketable securities	143,536	321,615	[1]
Accounts receivable, net of allowances of $89 at December 31, 2013	0	199	[1]
Receivables from collaborative arrangements (including amounts from a related party of $4,012 and $2,247 at September 30, 2014 and December 31, 2013)	4,012	3,181	[1]
Prepaid expenses and other current assets	748	4,287	[1]
Inventories	0	10,406	[1]
Total current assets	273,471	483,198	[1]
Marketable securities	47,752	55,374	[1]
Restricted cash	833	833	[1]
Property and equipment, net	64	10,238	[1]
Intangible assets, net	211,646	124,257	[1]
Other assets	19,947	7,355	[1]
Total assets	553,713	681,255	[1]
Current liabilities:
Accounts payable	573	7,583	[1]
Payable to a related party	10,000	40,000	[1]
Accrued personnel-related expenses	1,203	10,881	[1]
Accrued clinical and development expenses	0	9,714	[1]
Accrued interest payable	19,467	2,800	[1]
Other accrued liabilities	3,773	4,137	[1]
Deferred revenue	1,082	9,289	[1]
Total current liabilities	36,098	84,404	[1]
Convertible subordinated notes	255,109	287,500	[1]
Non-recourse notes payable, due 2029	450,000	0	[1]
Deferred rent	54	4,774	[1]
Other long-term liabilities	1,530	0	[1]
Deferred revenue	4,058	5,455	[1]
Commitments and contingencies (Notes 3, 6 and 8)			[1]
Stockholders' (deficit) equity :
Common stock, $0.01 par value; authorized: 200,000 shares; issued: 115,380 and 111,516 at September 30, 2014 and December 31, 2013	1,154	1,115	[1]
Treasury stock, 150 and 0 shares at September 30, 2014 and December 31, 2013	(3,263)	0	[1]
Additional paid-in capital	1,466,911	1,803,048	[1]
Accumulated other comprehensive (loss) income	(197)	162	[1]
Accumulated deficit	(1,657,741)	(1,505,203)	[1]
Total stockholders' (deficit) equity	(193,136)	299,122	[1]
Total liabilities and stockholders' (deficit) equity	$ 553,713	$ 681,255	[1]

[1] Condensed consolidated balance sheet at December 31, 2013 has been derived from audited consolidated financial statements.