Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 377,013	$ 378,123
Short-term investments	820,962	873,073
Accounts receivable - net of allowance for doubtful accounts of $1,768 and $1,993 at December 31, 2021 and 2020, respectively	157,362	126,433
Deferred commission expense	59,849	44,576
Prepaid expenses and other current assets	38,388	34,716
Total current assets	1,453,574	1,456,921
Long-term investments	174,895	30,697
Property and equipment, net	96,134	101,123
Capitalized software development costs, net	39,858	24,943
Right-of-use assets	280,828	275,893
Deferred commission expense, net of current portion	42,681	28,296
Other assets	29,244	13,893
Intangible assets, net	10,565	10,282
Goodwill	47,075	31,318
Total assets	2,174,854	1,973,366
Current liabilities:
Accounts payable	2,773	13,540
Accrued compensation costs	63,836	44,054
Accrued expenses and other current liabilities	74,457	37,184
Convertible senior notes	19,630	7,837
Operating lease liabilities	26,364	30,020
Deferred revenue	430,414	312,866
Total current liabilities	617,474	445,501
Operating lease liabilities, net of current portion	283,873	279,664
Deferred revenue, net of current portion	4,473	3,636
Other long-term liabilities	12,134	10,811
Convertible senior notes, net of current portion	383,101	471,099
Total liabilities	1,301,055	1,210,711
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.001 par value - 500,000 shares authorized; 48,000 and 46,115 shares issued; 47,390 and 46,115 shares outstanding at December 31, 2021 and 2020, respectively	47	46
Additional paid-in capital	1,436,089	1,241,167
Accumulated other comprehensive (loss) income	(1,339)	4,603
Accumulated deficit	(560,998)	(483,161)
Total stockholders’ equity	873,799	762,655
Total liabilities and stockholders’ equity	$ 2,174,854	$ 1,973,366