CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 69,747	$ 56,115
Cash held as collateral	216	1,451
Accounts receivable, net of allowance for doubtful accounts of $1,672 and $1,318 as of June 30, 2018 and December 31, 2017, respectively	38,109	37,926
Prepaid expenses and other current assets	16,885	7,352
Total current assets	124,957	102,844
Property and equipment, net	38,066	34,705
Intangibles, net	12,321	12,366
Goodwill	80,473	80,531
Deferred tax assets	817	753
Other assets	1,787	1,600
Total assets	258,421	232,799
CURRENT LIABILITIES:
Accounts payable	6,207	5,481
Accrued expenses and other current liabilities	39,252	48,011
Deferred revenue	47,375	35,563
Total current liabilities	92,834	89,055
Deferred revenue	2,131	0
Other liabilities	2,584	2,766
Deferred tax liability	1,020	915
Total liabilities	98,569	92,736
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock	62	60
Additional paid-in capital	337,238	305,676
Treasury stock	(3)	(3)
Accumulated deficit	(173,983)	(163,135)
Accumulated other comprehensive loss	(3,462)	(2,535)
Total stockholders’ equity	159,852	140,063
Total liabilities and stockholders’ equity	$ 258,421	$ 232,799