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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 365,767 $ 157,591
Accounts receivable 2,744 2,935
Prepaid expenses 1,984 4,211
Total current assets 370,495 164,737
Restricted cash 0 300
Property and equipment, net 11,530 6,785
Other assets 2,064 2,064
Total assets 384,089 173,886
Current liabilities:    
Accounts payable 2,541 1,669
Accrued expenses 9,120 7,930
Lease exit liability 1,958 1,642
Deferred revenue 7,163 14,248
Other liabilities 1,605 1,605
Total current liabilities 22,387 27,094
Lease exit liability, net of current portion 3,215 6,364
Deferred rent liability 7,272 2,670
Deferred revenue, net of current portion 11,889 16,472
Total liabilities 44,763 52,600
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 34,248,240 and 27,995,638 shares outstanding at September 30, 2015 and December 31, 2014, respectively 342 280
Treasury stock, at cost; no shares at September 30, 2015 and 865 shares at December 31, 2014 0 (19)
Additional paid-in capital 544,719 335,071
Accumulated deficit (205,735) (214,046)
Total stockholders' equity 339,326 121,286
Total liabilities and stockholders' equity $ 384,089 $ 173,886