Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 654,152	$ 176,523
Accounts receivable, net of allowance for doubtful accounts of $5,344 and $3,070, in 2020 and 2019, respectively	80,423	87,620
Prepaid expenses and other current assets	14,236	13,964
Total current assets	748,811	278,107
Operating lease right of use asset	614	15,680
Property and equipment, net	106,055	76,236
Contract acquisition costs	41,021	31,965
Intangibles, net	10,927	11,812
Goodwill	95,192	94,987
Deferred tax assets	2,032	2,179
Other assets	1,780	1,744
Total assets	1,006,432	512,710
CURRENT LIABILITIES:
Accounts payable	14,115	12,302
Accrued expenses and other current liabilities	99,870	62,778
Deferred revenue	88,848	88,751
Operating lease liability	5,718	6,602
Total current liabilities	208,551	170,433
Deferred revenue, net of current portion	409	438
Convertible senior notes, net	538,432	179,012
Other liabilities	6,304	72
Operating lease liability, net of current portion	7,180	12,865
Deferred tax liability	1,622	1,355
Total liabilities	762,498	364,175
Commitments and contingencies
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 and 200,000,000 shares authorized, 70,264,265 and 66,543,073 shares issued, and 67,554,435 and 63,833,243 shares outstanding as of December 31, 2020 and 2019, respectively	70	67
Additional paid-in capital	635,672	436,557
Treasury stock, at cost; 2,709,830 shares	(3)	(3)
Accumulated deficit	(391,885)	(283,562)
Accumulated other comprehensive income (loss)	80	(4,524)
Total stockholders’ equity	243,934	148,535
Total liabilities and stockholders’ equity	$ 1,006,432	$ 512,710