BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 103,857	$ 119,471
Short-term investments available-for-sale	48,599	13,597
Restricted cash	203	1,417
Accounts receivable - billed	3,719	1,911
Account receivable - unbilled	4,839	4,988
Prepaid expenses	5,116	3,044
Other current assets	269	573
Total current assets	166,602	145,001
Investments available-for-sale	56,352
Property and equipment, net	15,124	14,251
Intangible assets, net	15,090	16,250
Goodwill	57,906	58,707
Restricted cash	758	757
Other non-current assets	159	159
Total assets	311,991	235,125
Current liabilities:
Accounts payable	4,495	5,985
Accrued expenses and other current liabilities	10,998	10,411
Deferred revenue	25	271
Current portion of capital leases	97	108
Current portion of notes payable	822	877
Deferred rent	1,042	470
Total current liabilities	17,479	18,122
Deferred revenue	2,500	2,500
Non-current portion of capital leases	172	195
Non-current portion of notes payable	717	1,004
Deferred rent	7,885	8,502
Other non-current liabilities	1,507	1,568
Total liabilities	30,260	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 June 30, 2014 and December 31, 2013, respectively
Common stock, $0.01 par value, 300,000,000 shares authorized; 238,575,480 shares issued and 238,120,050 shares outstanding at June 30, 2014 and 209,110,744 shares issued and 208,655,314 shares outstanding at December 31, 2013	2,386	2,091
Additional paid-in capital	724,908	612,900
Accumulated deficit	(441,820)	(410,146)
Treasury stock, 455,430 shares, cost basis at both June 30, 2014 and December 31, 2013	(2,450)	(2,450)
Accumulated other comprehensive income (loss)	(1,293)	839
Total stockholders' equity	281,731	203,234
Total liabilities and stockholders' equity	$ 311,991	$ 235,125