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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 84,098 $ 196,172
Marketable securities 192,898 142,877
Accounts receivable 2,764 1,224
Prepaid expenses 3,483 1,806
Other current assets 704 305
Total current assets 283,947 342,384
Property and equipment, net 17,961 14,841
Marketable securities, non-current 7,986 0
Other assets 1,369 2,044
Total assets 311,263 359,269
Current liabilities:    
Accounts payable 3,995 2,967
Accrued expenses 16,134 11,708
Deferred revenue 4,261 5,866
Deferred rent 1,319 914
Lease exit liability 1,593 2,020
Other current liabilities 0 727
Total current liabilities 27,302 24,202
Deferred revenue, net of current portion 10,045 12,631
Deferred rent, net of current portion 4,867 6,406
Lease exit liability, net of current portion 298 2,693
Total liabilities 42,512 45,932
Stockholders' equity:    
Common stock, $0.01 par value – 125,000,000 shares authorized, 34,870,607 and 34,345,754 shares outstanding at December 31, 2016 and 2015, respectively 349 343
Additional paid-in capital 561,198 547,185
Accumulated other comprehensive loss (82) (5)
Accumulated deficit (292,714) (234,186)
Total stockholders' equity 268,751 313,337
Total liabilities and stockholders' equity $ 311,263 $ 359,269