Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 136,733	$ 35,693
Short-term marketable securities		5,697
Accounts receivable—net of allowance of $322 and $318 at March 31, 2018 and December 31, 2017, respectively	25,515	34,312
Prepaid expenses	9,493	11,492
Deferred commissions	6,994	7,086
Other current assets	1,616	2,419
Total current assets	180,351	96,699
Property and equipment, net	27,115	23,926
Goodwill	12,354	12,354
Intangible assets, net	8,288	9,048
Noncurrent prepaid expenses	3,121	2,939
Deferred commissions, net of current portion	11,040	11,160
Other assets	487	497
Total assets	242,756	156,623
Current liabilities:
Accounts payable	6,439	2,892
Accrued liabilities	12,501	13,702
Deferred rent	986	936
Deferred revenue	77,671	99,773
Total current liabilities	97,597	117,303
Deferred revenue, net of current portion	1,436	1,889
Deferred rent, net of current portion	10,523	9,201
Other long-term liabilities	775	1,286
Total liabilities	110,331	129,679
Stockholders’ equity:
Common stock	3	3
Additional paid-in capital	368,247	250,899
Accumulated other comprehensive loss		(1)
Accumulated deficit	(235,825)	(223,957)
Total stockholders’ equity	132,425	26,944
Total liabilities and stockholders’ equity	$ 242,756	$ 156,623