BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 109,921	$ 119,471
Short-term investments available-for-sale	2,907	13,597
Restricted cash	336	1,417
Accounts receivable	4,466	1,911
Unbilled receivables	6,113	4,988
Prepaid expenses	4,626	3,044
Other current assets	504	573
Total current assets	128,873	145,001
Property and equipment, net	14,270	14,251
Intangible assets, net	15,918	16,250
Goodwill	58,621	58,707
Restricted cash	758	757
Other non-current assets	159	159
Total assets	218,599	235,125
Current liabilities:
Accounts payable	4,018	5,985
Accrued expenses and other current liabilities	8,208	10,411
Deferred revenue	57	271
Current portion of capital leases	105	108
Current portion of notes payable	852	877
Deferred rent	475	470
Total current liabilities	13,715	18,122
Deferred revenue	2,500	2,500
Non-current portion of capital leases	191	195
Non-current portion of notes payable	861	1,004
Deferred rent	8,710	8,502
Other non-current liabilities	1,562	1,568
Total liabilities	27,539	31,891
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 shares authorized; and 209,711,305 shares issued and 209,255,875 shares outstanding at March 31, 2014 and 209,110,744 shares issued and 208,655,314 shares outstanding at December 31, 2013	2,097	2,091
Additional paid-in capital	615,279	612,900
Accumulated deficit	(423,956)	(410,146)
Treasury stock, 455,430 shares, cost basis	(2,450)	(2,450)
Accumulated other comprehensive income	90	839
Total stockholders' equity	191,060	203,234
Total liabilities and stockholders' equity	$ 218,599	$ 235,125