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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 90,884 $ 84,098
Marketable securities 112,763 192,898
Accounts receivable 2,194 2,764
Prepaid expenses 3,261 3,483
Other current assets 364 704
Total current assets 209,466 283,947
Property and equipment, net 30,838 17,961
Marketable securities, non-current 0 7,986
Other assets 1,541 1,369
Total assets 241,845 311,263
Current liabilities:    
Accounts payable 1,680 3,995
Accrued expenses 25,501 16,134
Deferred revenue 3,202 4,261
Deferred rent 1,165 1,319
Lease exit liability 715 1,593
Other liabilities 175 0
Total current liabilities 32,438 27,302
Deferred revenue, net of current portion 8,438 10,045
Deferred rent, net of current portion 11,504 4,867
Lease exit liability, net of current portion 0 298
Total liabilities 52,380 42,512
Stockholders' equity:    
Common stock, $0.01 par value – 125,000,000 shares authorized, 36,807,112 and 34,870,607 shares outstanding at September 30, 2017 and December 31, 2016, respectively 368 349
Additional paid-in capital 607,191 561,198
Accumulated deficit (418,067) (292,714)
Accumulated other comprehensive loss (27) (82)
Total stockholders' equity 189,465 268,751
Total liabilities and stockholders' equity $ 241,845 $ 311,263