CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 109,258	$ 93,677
Marketable securities	138,440	131,190
Accounts receivable, net of allowance for doubtful accounts of $2,264 and $1,269 as of March 31, 2017 and December 31, 2016, respectively	39,105	37,343
Prepaid expenses and other current assets	17,982	17,608
Total current assets	304,785	279,818
Marketable securities, noncurrent	68,320	75,168
Property and equipment, net	60,842	62,731
Goodwill and intangible assets, net	52,699	53,296
Other assets	4,382	4,272
Total assets	491,028	475,285
Current liabilities:
Accounts payable	5,890	4,555
Accrued liabilities	18,448	19,106
Accrued compensation and related benefits	21,664	20,281
Deferred revenue	130,129	123,276
Total current liabilities	176,131	167,218
Deferred revenue, noncurrent	1,989	1,257
Other liabilities	7,511	7,382
Total liabilities	185,631	175,857
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock	0	0
Common stock	991	971
Additional paid-in capital	655,792	624,026
Accumulated other comprehensive loss	(3,792)	(5,197)
Accumulated deficit	(346,942)	(319,720)
Treasury stock at cost (0.5 million shares as of March 31, 2017 and December 31, 2016)	(652)	(652)
Total stockholders’ equity	305,397	299,428
Total liabilities and stockholders’ equity	$ 491,028	$ 475,285