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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