Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 397,498	$ 378,123
Short-term investments	782,335	873,073
Accounts receivable — net of allowance for doubtful accounts of $1,671 and $1,993 at March 31, 2021 and December 31, 2020, respectively	109,602	126,433
Deferred commission expense	47,279	44,576
Prepaid expenses and other current assets	31,459	34,716
Total current assets	1,368,173	1,456,921
Long-term investments	105,990	30,697
Property and equipment, net	96,845	101,123
Capitalized software development costs, net	28,340	24,943
Right-of-use assets	261,601	275,893
Deferred commission expense, net of current portion	30,607	28,296
Other assets	18,795	13,893
Intangible assets, net	11,878	10,282
Goodwill	47,588	31,318
Total assets	1,969,817	1,973,366
Current liabilities:
Accounts payable	17,907	13,540
Accrued compensation costs	44,856	44,054
Accrued expenses and other current liabilities	40,868	37,184
Convertible senior notes	11,810	7,837
Operating lease liabilities	30,563	30,020
Deferred revenue	336,183	312,866
Total current liabilities	482,187	445,501
Operating lease liabilities, net of current portion	265,664	279,664
Deferred revenue, net of current portion	3,227	3,636
Other long-term liabilities	11,399	10,811
Convertible senior notes	432,626	471,099
Total liabilities	1,195,103	1,210,711
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock	47	46
Additional paid-in capital	1,279,113	1,241,167
Accumulated other comprehensive loss	1,874	4,603
Accumulated deficit	(506,320)	(483,161)
Total stockholders’ equity	774,714	762,655
Total liabilities and stockholders’ equity	$ 1,969,817	$ 1,973,366