Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 14,848	$ 10,743
Short-term investments	61,424	97,306
Accounts receivable	757	471
Prepaid expenses and other current assets	370	277
Total current assets	77,399	108,797
Certificate of deposit	2,085	2,176
In-process research and development	58,200	77,900
Goodwill	0	6,290
Deposits	212	0
Fixed assets, net	1,937	1,102
Total assets	139,833	196,265
Current liabilities:
Accounts payable	2,334	1,450
Accrued expenses	800	139
Accrued compensation	795	1,117
Accrued lease expense, current	278	0
Deferred rent	156	150
Capital lease obligations, current	114	81
Deferred revenue	0	402
Total current liabilities	4,477	3,339
Accrued lease expense, long-term	923	0
Capital lease obligations, long-term	166	83
Total liabilities	5,566	3,422
Stockholders' equity:
Common stock; $.01 par value; authorized shares 500,000,000; issued and outstanding shares, 24,833,301 in 2011 and 15,653,734 in 2010	248	1,565
Preferred stock; $.01 par value; authorized shares 200,000,000; issued and outstanding shares, zero in 2011 and 9,174,589 in 2010	0	918
Additional paid-in capital	427,743	423,877
Accumulated deficit	(294,174)	(234,510)
Unrealized gain on investments	450	993
Total stockholders' equity	134,267	192,843
Total liabilities and stockholders' equity	$ 139,833	$ 196,265