CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 173,177	$ 176,523
Accounts receivable, net of allowances of $7,346 and $4,226 as of June 30, 2020 and December 31, 2019, respectively	75,187	87,620
Prepaid expenses and other current assets	19,315	13,964
Total current assets	267,679	278,107
Operating lease right of use asset	13,156	15,680
Property and equipment, net	91,238	76,236
Contract acquisition costs	36,143	31,965
Intangibles, net	11,109	11,812
Goodwill	94,989	94,987
Deferred tax assets	2,107	2,179
Other assets	1,736	1,744
Total assets	518,157	512,710
CURRENT LIABILITIES:
Accounts payable	10,868	12,302
Accrued expenses and other current liabilities	65,963	62,778
Deferred revenue	92,090	88,751
Operating lease liability	6,196	6,602
Total current liabilities	175,117	170,433
Deferred revenue, net of current portion	3,122	438
Convertible senior notes, net	184,389	179,012
Other liabilities	96	72
Operating lease liability, net of current portion	10,725	12,865
Deferred tax liability	1,394	1,355
Total liabilities	374,843	364,175
Commitments and contingencies (Note 11)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.001 par value - 5,000,000 shares authorized, none issued	0	0
Common stock, $0.001 par value - 200,000,000 shares authorized, 68,731,477 and 66,543,073 shares issued, 66,021,647 and 63,833,243 shares outstanding as of June 30, 2020 and December 31, 2019, respectively	69	67
Additional paid-in capital	488,229	436,557
Treasury stock	(3)	(3)
Accumulated deficit	(339,919)	(283,562)
Accumulated other comprehensive loss	(5,062)	(4,524)
Total stockholders’ equity	143,314	148,535
Total liabilities and stockholders’ equity	$ 518,157	$ 512,710