BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 34,473	$ 119,471
Short-term investments available-for-sale	143,617	13,597
Restricted cash		1,417
Accounts receivable - billed	2,859	1,911
Account receivable - unbilled	4,233	4,988
Prepaid expenses	6,395	3,044
Other current assets	402	573
Total current assets	191,979	145,001
Investments available-for-sale	12,189
Property and equipment, net	17,492	14,251
Intangible assets, net	13,763	16,250
Goodwill	56,174	58,707
Restricted cash	758	757
Other non-current assets	159	159
Total assets	292,514	235,125
Current liabilities:
Accounts payable	2,975	5,985
Accrued expenses and other current liabilities	13,712	10,411
Deferred revenue	3	271
Current portion of capital leases	89	108
Current portion of notes payable	795	877
Deferred rent	1,061	470
Total current liabilities	18,635	18,122
Deferred revenue	2,500	2,500
Non-current portion of capital leases	150	195
Non-current portion of notes payable	571	1,004
Deferred rent	7,609	8,502
Other non-current liabilities	1,399	1,568
Total liabilities	30,864	31,891
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 2,000,000 shares authorized; no shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively
Common stock, $0.01 par value, 300,000,000 shares authorized; 238,913,904 shares issued and 238,458,474 shares outstanding at September 30, 2014 and 209,110,744 shares issued and 208,655,314 shares outstanding at December 31, 2013	2,389	2,091
Additional paid-in capital	727,369	612,900
Accumulated deficit	(461,547)	(410,146)
Treasury stock, 455,430 shares, cost basis at both September 30, 2014 and December 31, 2013	(2,450)	(2,450)
Accumulated other comprehensive income (loss)	(4,111)	839
Total stockholders' equity	261,650	203,234
Total liabilities and stockholders' equity	$ 292,514	$ 235,125