CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 237,787	$ 66,449
Accounts receivable, net of allowance for doubtful accounts of $2,728 and $2,276 as of March 31, 2019 and December 31, 2018, respectively	51,285	46,023
Prepaid expenses and other current assets	29,290	22,613
Total current assets	318,362	135,085
Operating lease right of use asset	14,817
Property and equipment, net	48,432	43,735
Intangibles, net	13,077	13,832
Goodwill	94,987	95,031
Deferred tax assets	714	713
Other assets	1,822	1,707
Total assets	492,211	290,103
CURRENT LIABILITIES:
Accounts payable	7,331	8,174
Accrued expenses and other current liabilities	35,897	50,662
Deferred revenue	66,210	55,015
Operating lease liability	6,227
Total current liabilities	115,665	113,851
Deferred revenue	177	222
Convertible senior note, net	171,294	0
Other liabilities	320	4,205
Operating lease liability	12,566
Deferred tax liability	1,150	1,096
Total liabilities	301,172	119,374
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock	65	64
Additional paid-in capital	401,996	362,590
Treasury stock	(3)	(3)
Accumulated deficit	(206,381)	(187,491)
Accumulated other comprehensive loss	(4,638)	(4,431)
Total stockholders’ equity	191,039	170,729
Total liabilities and stockholders’ equity	$ 492,211	$ 290,103