Consolidated Balance Sheets (unaudited) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 58,975 $ 90,471
Short-term marketable securities 24,334 325
Accounts receivable—net of allowance of $269 and $225 at September 30, 2016 and December 31, 2015, respectively 23,087 9,523
Prepaid expenses 4,572 5,010
Other current assets 472 614
Total current assets 111,440 105,943
Property and equipment, net 13,805 11,732
Goodwill 989 989
Intangible assets, net 471 444
Noncurrent prepaid expenses 622 749
Other assets 1,027 1,203
Total assets 128,354 121,060
Current liabilities:    
Accounts payable 5,977 3,912
Accrued liabilities 10,873 8,852
Deferred rent 708 541
Deferred revenue 81,563 49,384
Total current liabilities 99,121 62,689
Deferred revenue, net of current portion 3,222 2,941
Deferred rent, net of current portion 8,532 9,078
Warrant liability 35 331
Other long-term liabilities 36 402
Total liabilities 110,946 75,441
Stockholders’ equity:    
Common stock 3 4
Treasury stock   (1)
Additional paid-in capital 200,961 188,517
Accumulated other comprehensive loss (9)  
Accumulated deficit (183,547) (142,901)
Total stockholders’ equity 17,408 45,619
Total liabilities and stockholders’ equity $ 128,354 $ 121,060