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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 211,727 | $ 84,098
Marketable securities | 93,394 | 192,898
Accounts receivable | 13,643 | 2,764
Prepaid expenses | 3,151 | 3,483
Other current assets | 383 | 704
Total current assets | 322,298 | 283,947
Property, equipment and software, net | 49,983 | 17,961
Marketable securities, non-current | 0 | 7,986
Other assets | 1,602 | 1,369
Total assets | 373,883 | 311,263
Current liabilities: |  |
Accounts payable | 2,451 | 3,995
Accrued expenses | 38,581 | 16,134
Deferred revenue | 7,202 | 4,261
Deferred rent | 1,048 | 1,319
Lease exit liability | 298 | 1,593
Other current liabilities | 175 | 0
Total current liabilities | 49,755 | 27,302
Deferred revenue, net of current portion | 13,637 | 10,045
Deferred rent, net of current portion | 11,253 | 4,867
Lease exit liability, net of current portion | 0 | 298
Total liabilities | 74,645 | 42,512
Stockholders' equity: |  |
Common stock, $0.01 par value – 125,000,000 shares authorized, 36,859,077 and 34,870,607 shares outstanding at December 31, 2017 and 2016, respectively | 369 | 349
Additional paid-in capital | 611,270 | 561,198
Accumulated other comprehensive loss | (61) | (82)
Accumulated deficit | (312,340) | (292,714)
Total stockholders' equity | 299,238 | 268,751
Total liabilities and stockholders' equity | $ 373,883 | $ 311,263

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