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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 180,316 | $ 220,128
Marketable securities | 91,820 | 12,735
Accounts receivable | 5,613 | 29,583
Prepaid expenses | 9,616 | 6,406
Other current assets | 232 | 272
Total current assets | 287,597 | 269,124
Property, equipment and software, net | 52,295 | 56,712
Other assets | 43,785 | 6,294
Total assets | 383,677 | 332,130
Current liabilities: |  |
Accounts payable | 857 | 4,005
Accrued expenses | 30,410 | 33,021
Deferred revenue | 14,449 | 21,721
Deferred rent | 0 | 1,018
Lease liabilities | 3,644 | 0
Other current liabilities | 175 | 175
Total current liabilities | 49,535 | 59,940
Deferred revenue, net of current portion | 15,413 | 19,001
Lease liabilities, net of current portion | 24,278 | 0
Deferred rent, net of current portion | 0 | 10,312
Total liabilities | 89,226 | 89,253
Stockholders' equity: |  |
Common stock, $0.01 par value -- 125,000,000 shares authorized, 48,893,451 and 42,353,301 shares outstanding at June 30, 2019 and December 31, 2018, respectively | 489 | 424
Additional paid-in capital | 860,983 | 732,727
Accumulated other comprehensive income (loss) | 34 | (3)
Accumulated deficit | (567,055) | (490,271)
Total stockholders' equity | 294,451 | 242,877
Total liabilities and stockholders' equity | $ 383,677 | $ 332,130

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