Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 285,126	$ 111,489
Short-term investments	683,994	480,761
Accounts receivable — net of allowance for doubtful accounts of $1,464 and $1,317 at March 31, 2019 and December 31, 2018, respectively	69,249	77,100
Deferred commission expense	26,370	23,664
Restricted cash	5,569	5,175
Prepaid expenses and other current assets	13,143	14,229
Total current assets	1,083,451	712,418
Long-term investments	14,548	11,450
Property and equipment, net	54,995	52,468
Capitalized software development costs, net	13,365	12,746
Right-of-use assets	159,096
Deferred commission expense, net of current portion	18,535	18,114
Other assets	7,066	6,888
Intangible assets, net	4,119	4,919
Goodwill	14,950	14,950
Total assets	1,370,125	833,953
Current liabilities:
Accounts payable	14,859	7,810
Accrued compensation costs	21,360	23,589
Accrued expenses and other current liabilities	25,284	22,305
Lease liabilities	15,928
Deferred revenue	191,193	183,305
Total current liabilities	268,624	237,009
Lease liabilities, net of current portion	171,200
Deferred rent, net of current portion		26,445
Deferred revenue, net of current portion	2,263	2,179
Other long-term liabilities	4,993	4,897
Convertible senior notes	324,042	318,782
Total liabilities	771,122	589,312
Commitments and contingencies (Note 10)
Stockholders’ equity:
Common stock	43	40
Additional paid-in capital	955,045	589,708
Accumulated other comprehensive loss	(601)	(723)
Accumulated deficit	(355,484)	(344,384)
Total stockholders’ equity	599,003	244,641
Total liabilities and stockholders’ equity	$ 1,370,125	$ 833,953