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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 196,172 $ 157,591
Marketable securities 142,877 0
Accounts receivable 1,224 2,935
Prepaid expenses 1,806 4,211
Other current assets 305 0
Total current assets 342,384 164,737
Restricted cash 0 300
Property and equipment, net 14,841 6,785
Other assets 2,044 2,064
Total assets 359,269 173,886
Current liabilities:    
Accounts payable 2,967 1,669
Accrued expenses 11,708 7,930
Lease exit liability 2,020 1,642
Deferred revenue 5,866 14,248
Other liabilities 727 1,605
Total current liabilities 23,288 27,094
Lease exit liability, net of current portion 2,693 6,364
Deferred rent liability 7,320 2,670
Deferred revenue, net of current portion 12,631 16,472
Total liabilities 45,932 52,600
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 34,345,754 and 27,995,638 shares outstanding at December 31, 2015 and 2014, respectively 343 280
Treasury stock, at cost; no shares at December 31, 2015 and 865 shares at December 31, 2014 0 (19)
Additional paid-in capital 547,185 335,071
Accumulated other comprehensive loss (5) 0
Accumulated deficit (234,186) (214,046)
Total stockholders' equity 313,337 121,286
Total liabilities and stockholders' equity $ 359,269 $ 173,886