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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 238,641 | $ 220,128
Marketable securities | 81,750 | 12,735
Accounts receivable | 6,115 | 29,583
Prepaid expenses | 8,309 | 6,406
Other current assets | 218 | 272
Total current assets | 335,033 | 269,124
Property, equipment and software, net | 54,818 | 56,712
Other assets | 24,787 | 6,294
Total assets | 414,638 | 332,130
Current liabilities: |  |
Accounts payable | 925 | 4,005
Accrued expenses | 28,852 | 33,021
Deferred revenue | 18,085 | 21,721
Deferred rent | 0 | 1,018
Lease liabilities | 3,734 | 0
Other liabilities | 175 | 175
Total current liabilities | 51,771 | 59,940
Deferred revenue, net of current portion | 17,207 | 19,001
Lease liabilities, net of current portion | 25,043 | 0
Deferred rent, net of current portion | 0 | 10,312
Total liabilities | 94,021 | 89,253
Stockholders' equity: |  |
Common stock, $0.01 par value -- 125,000,000 shares authorized, 48,805,008 and 42,353,301 shares outstanding at March 31, 2019 and December 31, 2018, respectively | 488 | 424
Additional paid-in capital | 855,417 | 732,727
Accumulated other comprehensive loss | 0 | (3)
Accumulated deficit | (535,288) | (490,271)
Total stockholders' equity | 320,617 | 242,877
Total liabilities and stockholders' equity | $ 414,638 | $ 332,130

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