Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 21,164	$ 20,891
Restricted cash	151	308
Investments	16,891	14,708
Receivables	2,115	4,562
Prepaid expenses and other current assets	1,725	1,097
Deferred collaboration expense	75	412
Total current assets	42,121	41,978
Investments	2,582	1,151
Furniture and equipment, net	306	583
Deferred collaboration expense	237	5,033
Other assets	3,620	8,694
Total assets	48,866	57,439
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	4,174	3,974
Accrued expenses	5,742	9,860
Interest payable	3,867	1,998
Deferred collaboration revenue	1,473	1,392
Total current liabilities	15,256	17,224
Deferred collaboration revenue	4,736	5,920
Foreign currency derivative		4,749
Non-recourse notes payable	30,000	30,000
Stockholders' equity:
Preferred stock, $0.001 par value; shares authorized - 5,000; no shares outstanding
Common stock, $0.01 par value; shares authorized - 95,000; shares issued and outstanding - 59,092 in 2013 and 50,893 in 2012	591	509
Additional paid-in capital	420,988	391,611
Accumulated other comprehensive income	4	27
Accumulated deficit	(422,709)	(392,601)
Total stockholders' (deficit) equity	(1,126)	(454)
Total liabilities and stockholders' equity	$ 48,866	$ 57,439