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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 181,131 | $ 126,472
Marketable securities | 91,400 | 89,284
Accounts receivable | 23,081 | 12,744
Prepaid expenses and other current assets | 16,982 | 11,285
Total current assets | 312,594 | 239,785
Property, equipment and software, net | 42,225 | 48,211
Other assets | 23,924 | 24,505
Total assets | 378,743 | 312,501
Current liabilities: |  |
Accounts payable | 8,031 | 4,308
Accrued expenses and other current liabilities | 34,198 | 27,139
Deferred revenue | 4,456 | 10,700
Lease liabilities | 3,988 | 3,020
Total current liabilities | 50,673 | 45,167
Deferred revenue, net of current portion | 6,926 | 9,153
Lease liabilities, net of current portion | 25,260 | 27,553
Total liabilities | 82,859 | 81,873
Stockholders' equity: |  |
Common stock, $0.01 par value -- 125,000,000 shares authorized, 56,244,771 and 48,958,763 shares outstanding at December 31, 2020 and December 31, 2019, respectively | 562 | 490
Additional paid-in capital | 1,067,150 | 872,204
Accumulated other comprehensive income (loss) | (7) | 16
Accumulated deficit | (771,821) | (642,082)
Total stockholders' equity | 295,884 | 230,628
Total liabilities and stockholders' equity | $ 378,743 | $ 312,501

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