Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 19,767	$ 20,891
Restricted cash	2,129	308
Investments	9,358	14,708
Receivables	1,024	4,562
Prepaid expenses and other current assets	1,179	1,097
Deferred collaboration expense	73	412
Total current assets	33,530	41,978
Investments		1,151
Furniture and equipment, net	425	583
Deferred collaboration expense	266	5,033
Other assets	5,695	8,694
Total assets	39,916	57,439
Liabilities and Stockholders' Equity
Accounts payable	989	3,974
Accrued expenses	5,773	9,860
Interest payable	3,658	1,998
Deferred collaboration revenue	1,538	1,392
Total current liabilities	11,958	17,224
Deferred collaboration revenue	5,327	5,920
Foreign currency derivative	1,678	4,749
Non-recourse notes payable	30,000	30,000
Stockholders' equity:
Preferred stock, $0.001 par value; shares authorized - 5,000; no shares issued and outstanding
Common stock, $0.01 par value: shares authorized - 95,000; shares issued and outstanding - 54,197 in 2013 and 50,893 in 2012	542	509
Additional paid-in capital	399,684	391,611
Accumulated other comprehensive income	6	27
Accumulated deficit	(409,279)	(392,601)
Total stockholders' deficit	(9,047)	(454)
Total liabilities and stockholders' equity	$ 39,916	$ 57,439