CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 313,983	$ 138,976
Available-for-sale securities	755,108	497,972
Accounts receivable, net	43,646	33,867
Contract assets	2,224	2,063
Prepaid expenses and other current assets	17,163	16,994
Total current assets	1,132,124	689,872
Property and equipment, net	114,549	101,466
Goodwill	17,167	4,083
Acquired intangible assets, net	4,200	31
Operating lease right-of-use assets	46,150	0
Deferred contract acquisition costs, noncurrent	33,880	25,184
Restricted cash	8,847	6,660
Other noncurrent assets	7,138	3,528
Total assets	1,364,055	830,824
Current liabilities:
Accounts payable	17,278	11,463
Accrued expenses and other current liabilities	32,076	28,314
Operating lease liabilities	17,239	0
Liability for early exercise of unvested stock options	10,735	13,263
Deferred revenue	43,419	30,843
Total current liabilities	120,747	83,883
Convertible senior notes, net	365,949	0
Build-to-suit lease financing obligation	0	10,506
Operating lease liabilities, noncurrent	30,869	0
Deferred revenue, noncurrent	1,599	804
Other noncurrent liabilities	9,273	9,803
Total liabilities	528,437	104,996
Commitments and contingencies (Note 8)
Stockholders’ Equity:
Additional paid-in capital	1,194,125	1,027,179
Accumulated deficit	(360,031)	(301,706)
Accumulated other comprehensive income	1,224	61
Total stockholders’ equity	835,618	725,828
Total liabilities and stockholders’ equity	1,364,055	830,824
Class A common stock
Stockholders’ Equity:
Common stock	184	87
Class B common stock
Stockholders’ Equity:
Common stock	$ 116	$ 207