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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 200,448 $ 211,727
Marketable securities 59,633 93,394
Accounts receivable 7,281 13,643
Prepaid expenses 3,328 3,151
Other current assets 349 383
Total current assets 271,039 322,298
Property and equipment, net 53,443 49,983
Other assets 1,596 1,602
Total assets 326,078 373,883
Current liabilities:    
Accounts payable 10,266 2,451
Accrued expenses 30,489 38,581
Deferred revenue 8,121 7,202
Deferred rent 905 1,048
Lease exit liability 0 298
Other liabilities 175 175
Total current liabilities 49,956 49,755
Deferred revenue, net of current portion 17,762 13,637
Deferred rent, net of current portion 11,084 11,253
Total liabilities 78,802 74,645
Stockholders' equity:    
Common stock, $0.01 par value – 125,000,000 shares authorized, 37,024,623 and 36,859,077 shares outstanding at March 31, 2018 and December 31, 2017, respectively 370 369
Additional paid-in capital 615,284 611,270
Accumulated deficit (368,355) (312,340)
Accumulated other comprehensive loss (23) (61)
Total stockholders' equity 247,276 299,238
Total liabilities and stockholders' equity $ 326,078 $ 373,883