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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 109,901 $ 196,172
Marketable securities 201,222 142,877
Accounts receivable 3,008 1,224
Prepaid expenses 1,311 1,806
Other current assets 844 305
Total current assets 316,286 342,384
Property and equipment, net 18,473 14,841
Other assets 2,104 2,044
Available-for-sale Securities, Noncurrent 3,001 0
Total assets 339,864 359,269
Current liabilities:    
Accounts payable 1,374 2,967
Accrued expenses 15,370 11,708
Deferred revenue 3,783 5,866
Lease exit liability 1,525 2,020
Other liabilities 0 727
Total current liabilities 22,052 23,288
Deferred revenue, net of current portion 9,794 12,631
Lease exit liability, net of current portion 715 2,693
Deferred rent liability 6,474 7,320
Other Liabilities, Noncurrent 727 0
Total liabilities 39,762 45,932
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 34,813,334 and 34,345,754 shares outstanding at September 30, 2016 and December 31, 2015, respectively 348 343
Additional paid-in capital 557,667 547,185
Accumulated deficit (257,931) (234,186)
Accumulated other comprehensive loss 18 (5)
Total stockholders' equity 300,102 313,337
Total liabilities and stockholders' equity $ 339,864 $ 359,269