Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 28,435	$ 37,714
Available-for-sale securities	58,252	72,238
Restricted cash	100	100
Accounts receivable	9,798	9,267
Prepaid expenses and other current assets	10,167	8,982
Total current assets	106,752	128,301
Restricted cash	528	528
Property and equipment, net	7,307	6,297
Other assets	34	1,068
Intangible assets, net	2,085	2,165
In-process research and development	7,010	7,010
Goodwill	3,605	3,605
Total assets	127,321	148,974
Current liabilities:
Accounts payable, accrued expenses and other	31,184	24,936
Deferred revenues	8,890	9,350
Deferred rent	1,243	1,153
Deferred tax incentives	512	512
Derivative liability	231	196
Loans payable	6,254	2,373
Total current liabilities	48,314	38,520
Deferred revenues	68,509	71,114
Deferred rent	6,735	6,323
Deferred tax incentives	627	755
Loans payable	34,076	37,482
Accrued interest	1,200	1,200
Total liabilities	159,461	155,394
Commitments and contingencies (Note 10)
Non-controlling interest (deficit)	(73)	97
Stockholders' deficit:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2012 and March 31, 2013; no shares issued or outstanding at December 31, 2012 and March 31, 2013
Common stock, $0.01 par value: 200,000 shares authorized at December 31, 2012 and March 31, 2013; 95,825 and 95,948 shares issued and outstanding at December 31, 2012 and March 31, 2013, respectively	959	958
Additional paid-in capital	437,263	434,679
Accumulated other comprehensive loss	(20)	(38)
Accumulated deficit	(470,269)	(442,116)
Total stockholders' deficit	(32,067)	(6,517)
Total liabilities, non-controlling interest (deficit) and stockholders' deficit	$ 127,321	$ 148,974