Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 58,716	$ 44,539
Short-term marketable securities	8,089	23,895
Accounts receivable—net of allowance of $355 and $241 at September 30, 2017 and December 31, 2016, respectively	35,465	18,072
Prepaid expenses	6,935	5,434
Other current assets	918	936
Total current assets	110,123	92,876
Property and equipment, net	20,907	14,733
Goodwill	989	989
Intangible assets, net	731	760
Noncurrent prepaid expenses	1,757	984
Other assets	974	994
Total assets	135,481	111,336
Current liabilities:
Accounts payable	10,146	5,374
Accrued liabilities	13,771	10,905
Deferred rent	897	773
Deferred revenue	109,280	72,747
Total current liabilities	134,094	89,799
Deferred revenue, net of current portion	3,942	3,144
Deferred rent, net of current portion	8,185	8,372
Warrant liability	123	25
Other long-term liabilities		32
Total liabilities	146,344	101,372
Stockholders’ equity (deficit):
Common stock	3	3
Additional paid-in capital	223,957	206,442
Accumulated other comprehensive loss	(1)	(12)
Accumulated deficit	(234,822)	(196,469)
Total stockholders’ equity (deficit)	(10,863)	9,964
Total liabilities and stockholders’ equity (deficit)	$ 135,481	$ 111,336