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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 220,128 | $ 211,727
Marketable securities | 12,735 | 93,394
Accounts receivable | 29,583 | 13,643
Prepaid expenses | 6,406 | 3,151
Other current assets | 272 | 383
Total current assets | 269,124 | 322,298
Property, equipment and software, net | 56,712 | 49,983
Other assets | 6,294 | 1,602
Total assets | 332,130 | 373,883
Current liabilities: |  |
Accounts payable | 4,005 | 2,451
Accrued expenses | 33,021 | 38,581
Deferred revenue | 21,721 | 7,202
Deferred rent | 1,018 | 1,048
Other current liabilities | 175 | 473
Total current liabilities | 59,940 | 49,755
Deferred revenue, net of current portion | 19,001 | 13,637
Deferred rent, net of current portion | 10,312 | 11,253
Total liabilities | 89,253 | 74,645
Stockholders' equity: |  |
Common stock, $0.01 par value -- 125,000,000 shares authorized, 42,353,301 and 36,859,077 shares outstanding at December 31, 2018 and December 31, 2017, respectively | 424 | 369
Additional paid-in capital | 732,727 | 611,270
Accumulated other comprehensive loss | (3) | (61)
Accumulated deficit | (490,271) | (312,340)
Total stockholders' equity | 242,877 | 299,238
Total liabilities and stockholders' equity | $ 332,130 | $ 373,883

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