Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 37,714	$ 50,454
Available-for-sale securities	72,238
Restricted cash	100
Accounts receivable	9,267	7,426
Deferred financing costs	32	1,946
Prepaid expenses and other current assets	8,950	5,763
Total current assets	128,301	65,589
Restricted cash	528	381
Property and equipment, net	6,297	6,206
Other assets	1,068	23
Intangible assets, net	2,165	2,485
In-process research and development	7,010	7,010
Goodwill	3,605	3,605
Total assets	148,974	85,299
Current liabilities:
Accounts payable, accrued expenses and other	24,936	17,511
Capital lease obligations		48
Deferred revenues	9,350	7,712
Deferred rent	1,153	125
Deferred tax incentives	512	755
Derivative liability	196
Loans payable	2,373
Total current liabilities	38,520	26,151
Deferred revenues	71,114	78,033
Deferred rent	6,323	23
Deferred tax incentives	755	1,267
Convertible preferred stock warrants		1,516
Loans payable	37,482
Accrued interest	1,200
Total liabilities	155,394	106,990
Commitments and contingencies (Note 19)
Convertible preferred stock		268,225
Non-controlling interest	97	574
Stockholders' deficit:
Preferred stock, $0.01 par value: no shares and 10,000 shares authorized at December 31 2011 and 2012, respectively; no shares issued or outstanding at December 31, 2011 or 2012
Common stock, $0.01 par value: 138,500 and 200,000 shares authorized at December 31, 2011 and 2012, respectively, 11,834 and 95,825 issued and outstanding at December 31, 2011 and 2012, respectively	958	118
Additional paid-in capital	434,679	60,231
Accumulated other comprehensive loss	(38)
Accumulated deficit	(442,116)	(350,839)
Total stockholders' deficit	(6,517)	(290,490)
Total liabilities, convertible preferred stock, non-controlling interest and stockholders' deficit	$ 148,974	$ 85,299