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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

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