Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 66,449	$ 56,115
Cash held as collateral	0	1,451
Accounts receivable, net of allowance for doubtful accounts of $2,276 and $1,318, in 2018 and 2017, respectively	46,023	37,926
Prepaid expenses and other current assets	22,613	7,352
Total current assets	135,085	102,844
Property and equipment, net	43,735	34,705
Intangibles, net	13,832	12,366
Goodwill	95,031	80,531
Deferred tax assets, net	713	753
Other assets	1,707	1,600
Total assets	290,103	232,799
CURRENT LIABILITIES:
Accounts payable	8,174	5,481
Accrued expenses and other current liabilities	50,662	48,011
Deferred revenue	55,015	35,563
Total current liabilities	113,851	89,055
Deferred revenue	222	0
Other liabilities	4,205	2,766
Deferred tax liability	1,096	915
Total liabilities	119,374	92,736
Commitments and contingencies (See Note 9)
STOCKHOLDERS' EQUITY:
Common stock	64	60
Additional paid-in capital	362,590	305,676
Treasury stock	(3)	(3)
Accumulated deficit	(187,491)	(163,135)
Accumulated other comprehensive loss	(4,431)	(2,535)
Total stockholders’ equity	170,729	140,063
Total liabilities and stockholders’ equity	$ 290,103	$ 232,799