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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 238,661 $ 211,727
Marketable securities 62,233 93,394
Accounts receivable 17,836 13,643
Prepaid expenses 3,173 3,151
Other current assets 151 383
Total current assets 322,054 322,298
Property, equipment and software, net 57,491 49,983
Other assets 7,346 1,602
Total assets 386,891 373,883
Current liabilities:    
Accounts payable 1,767 2,451
Accrued expenses 37,181 38,581
Deferred revenue 7,999 7,202
Deferred rent 905 1,048
Lease exit liability 0 298
Other liabilities 175 175
Total current liabilities 48,027 49,755
Deferred revenue, net of current portion 15,948 13,637
Deferred rent, net of current portion 10,880 11,253
Total liabilities 74,855 74,645
Stockholders' equity:    
Common stock, $0.01 par value -- 125,000,000 shares authorized, 42,229,011 and 36,859,077 shares outstanding at June 30, 2018 and December 31, 2017, respectively 422 369
Additional paid-in capital 723,196 611,270
Accumulated deficit (411,599) (312,340)
Accumulated other comprehensive income (loss) 17 (61)
Total stockholders' equity 312,036 299,238
Total liabilities and stockholders' equity $ 386,891 $ 373,883