Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 269,670	$ 111,489
Short-term investments	691,834	480,761
Accounts receivable—net of allowance for doubtful accounts of $1,584 and $1,317 at December 31, 2019 and 2018, respectively	92,517	77,100
Deferred commission expense	32,078	23,664
Restricted cash	5,816	5,175
Prepaid expenses and other current assets	17,809	14,229
Total current assets	1,109,724	712,418
Long-term investments	53,776	11,450
Property and equipment, net	83,649	52,468
Capitalized software development costs, net	16,793	12,746
Right-of-use assets	234,390
Deferred commission expense, net of current portion	19,110	18,114
Other assets	9,824	6,888
Intangible assets, net	11,752	4,919
Goodwill	30,250	14,950
Total assets	1,569,268	833,953
Current liabilities:
Accounts payable	12,842	7,810
Accrued compensation costs	26,318	23,589
Accrued expenses and other current liabilities	28,686	22,305
Operating lease liabilities	23,613
Deferred revenue	231,030	183,305
Total current liabilities	322,489	237,009
Operating lease liabilities, net of current portion	244,216
Deferred rent, net of current portion		26,445
Deferred revenue, net of current portion	3,058	2,179
Other long-term liabilities	8,983	4,897
Convertible senior notes	340,564	318,782
Total liabilities	919,310	589,312
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value—authorized, 500,000 shares; 42,955 and 39,300 shares issued and outstanding at December 31, 2019 and 2018, respectively	44	40
Additional paid-in capital	1,048,380	589,708
Accumulated other comprehensive loss	(336)	(723)
Accumulated deficit	(398,130)	(344,384)
Total stockholders’ equity	649,958	244,641
Total liabilities and stockholders’ equity	$ 1,569,268	$ 833,953