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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 116,627 $ 84,098
Marketable securities 127,033 192,898
Accounts receivable 1,991 2,764
Prepaid expenses 4,008 3,483
Other current assets 455 704
Total current assets 250,114 283,947
Property and equipment, net 23,179 17,961
Marketable securities, non-current 0 7,986
Other assets 1,553 1,369
Total assets 274,846 311,263
Current liabilities:    
Accounts payable 2,088 3,995
Accrued expenses 22,319 16,134
Deferred revenue 3,202 4,261
Deferred rent 1,160 1,319
Lease exit liability 1,120 1,593
Total current liabilities 29,889 27,302
Deferred revenue, net of current portion 9,238 10,045
Deferred rent, net of current portion 4,371 4,867
Lease exit liability, net of current portion 0 298
Total liabilities 43,498 42,512
Stockholders' equity:    
Common stock, $0.01 par value – 125,000,000 shares authorized, 36,680,522 and 34,870,607 shares outstanding at June 30, 2017 and December 31, 2016, respectively 367 349
Additional paid-in capital 602,085 561,198
Accumulated deficit (371,024) (292,714)
Accumulated other comprehensive loss (80) (82)
Total stockholders' equity 231,348 268,751
Total liabilities and stockholders' equity $ 274,846 $ 311,263