BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 119,471	$ 17,399
Short-term investments available-for-sale	13,597	26,712
Restricted cash	1,417	986
Accounts receivables	1,911	1,011
Unbilled receivables	4,988	1,570
Prepaid expenses	3,044	2,559
Other current assets	573	171
Total current assets	145,001	50,408
Investments available-for-sale		6,233
Property and equipment, net	14,251	11,456
Intangible assets, net	16,250
Goodwill	59,519	33,141
Restricted cash	757	756
Other non-current assets	159	351
Total assets	235,937	102,345
Current liabilities:
Accounts payable	5,985	3,228
Accrued expenses and other current liabilities	11,223	7,275
Deferred revenue	271	258
Current portion of capital leases	108	58
Current portion of notes payable	877	157
Warrant liability		267
Deferred rent	470	432
Total current liabilities	18,934	11,675
Deferred revenue	2,500	2,500
Non-current portion of capital leases	195	237
Non-current portion of notes payable	1,004	753
Deferred rent	8,502	6,940
Other non-current liabilities	1,568
Total liabilities	32,703	22,105
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, 300,000,000 and 200,000,000 shares authorized at December 31, 2013 and 2012, respectively; and 209,110,744 shares issued and 208,655,314 shares outstanding at December 31, 2013 and 148,398,747 shares issued and 147,943,317 shares outstanding at December 31, 2012	2,091	1,484
Additional paid-in capital	612,900	438,939
Accumulated deficit	(410,146)	(358,163)
Treasury stock, 455,430 shares, cost basis	(2,450)	(2,450)
Accumulated other comprehensive income	839	430
Total stockholders' equity	203,234	80,240
Total liabilities and stockholders' equity	$ 235,937	$ 102,345