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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 235,027 $ 157,591
Accounts receivable 4,334 2,935
Prepaid expenses 3,066 4,211
Total current assets 242,427 164,737
Restricted cash 300 300
Property and equipment, net 9,412 6,785
Other assets 2,064 2,064
Total assets 254,203 173,886
Current liabilities:    
Accounts payable 1,853 1,669
Accrued expenses 8,305 7,930
Lease exit liability 1,898 1,642
Deferred revenue 10,186 14,248
Other liabilities 1,605 1,605
Total current liabilities 23,847 27,094
Lease exit liability, net of current portion 3,725 6,364
Deferred rent liability 2,220 2,670
Deferred revenue, net of current portion 12,722 16,472
Total liabilities 42,514 52,600
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 30,123,407 and 27,995,638 shares outstanding at June 30, 2015 and December 31, 2014, respectively 301 280
Treasury stock, at cost; no shares at June 30, 2015 and 865 shares at December 31, 2014 0 (19)
Additional paid-in capital 401,681 335,071
Accumulated deficit (190,293) (214,046)
Total stockholders' equity 211,689 121,286
Total liabilities and stockholders' equity $ 254,203 $ 173,886