CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 92,603	$ 93,677
Marketable securities	133,959	131,190
Accounts receivable, net of allowance for doubtful accounts of $751 and $1,269 as of September 30, 2017 and December 31, 2016, respectively	51,465	37,343
Prepaid expenses and other current assets	24,318	17,608
Total current assets	302,345	279,818
Marketable securities, noncurrent	90,263	75,168
Property and equipment, net	59,600	62,731
Goodwill and intangible assets, net	67,779	53,296
Other assets	9,350	4,272
Total assets	529,337	475,285
Current liabilities:
Accounts payable	11,212	4,555
Accrued liabilities	21,588	19,106
Accrued compensation and related benefits	26,325	20,281
Deferred revenue	154,163	123,276
Total current liabilities	213,288	167,218
Deferred revenue, noncurrent	1,727	1,257
Other liabilities	8,152	7,382
Total liabilities	223,167	175,857
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock	0	0
Common stock	1,010	971
Additional paid-in capital	711,301	624,026
Accumulated other comprehensive loss	(2,205)	(5,197)
Accumulated deficit	(403,936)	(319,720)
Treasury stock, at cost (none and 0.5 million shares as of September 30, 2017 and December 31, 2016, respectively)	0	(652)
Total stockholders’ equity	306,170	299,428
Total liabilities and stockholders’ equity	$ 529,337	$ 475,285