BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 10,738	$ 14,104
Short-term investments available-for-sale	17,672	4,205
Restricted cash	838
Accounts receivables	2,469	1,965
Unbilled receivables	1,725	1,836
Prepaid expenses	2,807	2,441
Other current assets	235	1,558
Total current assets	36,484	26,109
Property and equipment, net	9,815	6,857
Goodwill	33,141	33,141
Restricted cash	756
Other non-current assets	350	469
Total assets	80,546	66,576
Current liabilities:
Accounts payable	2,203	2,645
Accrued expenses and other current liabilities	6,031	4,528
Deferred revenue	803
Current portion of capital lease	57
Current portion of notes payable	157	20
Warrant liability	769
Deferred rent	421	386
Total current liabilities	10,441	7,579
Deferred revenue	2,500	2,500
Non-current portion of capital lease	252
Non-current portion of notes payable	793	300
Warrant liability		368
Deferred rent	5,184	1,980
Total liabilities	19,170	12,727
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 2,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.01 par value, 200,000,000 shares authorized; and 136,003,676 shares issued and 135,548,246 shares outstanding at September 30, 2012 and 117,480,867 shares issued and 117,025,437 shares outstanding at December 31, 2011	1,360	1,175
Additional paid-in capital	411,558	383,948
Accumulated deficit	(350,128)	(329,656)
Treasury stock, 455,430 shares, cost basis	(2,450)	(2,450)
Accumulated other comprehensive income	1,036	832
Total stockholders' equity	61,376	53,849
Total liabilities and stockholders' equity	$ 80,546	$ 66,576