Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 30,943	$ 37,714
Available-for-sale securities	31,197	72,238
Restricted cash	100	100
Accounts receivable	14,537	9,267
Prepaid expenses and other current assets	9,170	8,982
Total current assets	85,947	128,301
Restricted cash	567	528
Property and equipment, net	8,155	6,297
Other assets	31	1,068
Intangible assets, net	2,005	2,165
In-process research and development	7,010	7,010
Goodwill	3,605	3,605
Total assets	107,320	148,974
Current liabilities:
Accounts payable, accrued expenses and other	36,322	24,936
Deferred revenues	9,336	9,350
Loans payable	9,970	2,373
Other current liabilities	2,119	1,861
Total current liabilities	57,747	38,520
Deferred revenues	68,724	71,114
Loans payable	30,592	37,482
Accrued interest	1,200	1,200
Other liabilities	7,398	7,078
Total liabilities	165,661	155,394
Commitments and contingencies (Note 10)
Non-controlling interest (deficit)	(242)	97
Stockholders' deficit:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2012 and June 30, 2013; no shares issued or outstanding at December 31, 2012 and June 30, 2013
Common stock, $0.01 par value: 200,000 shares authorized at December 31, 2012 and June 30, 2013; 95,825 and 96,360 shares issued and outstanding at December 31, 2012 and June 30, 2013, respectively	964	958
Additional paid-in capital	441,293	434,679
Accumulated other comprehensive loss	(5)	(38)
Accumulated deficit	(500,351)	(442,116)
Total stockholders' deficit	(58,099)	(6,517)
Total liabilities, non-controlling interest (deficit) and stockholders' deficit	$ 107,320	$ 148,974