CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 109,063	$ 138,976
Available-for-sale securities	478,791	497,972
Accounts receivable, net	39,778	33,867
Contract assets	1,779	2,063
Prepaid expenses and other current assets	18,193	16,994
Total current assets	647,604	689,872
Property and equipment, net	100,174	101,466
Goodwill	16,399	4,083
Acquired intangible assets, net	4,900	31
Operating lease right-of-use assets	48,234	0
Deferred contract acquisition costs, noncurrent	28,171	25,184
Restricted cash	8,847	6,660
Other noncurrent assets	4,202	3,528
Total assets	858,531	830,824
Current liabilities:
Accounts payable	14,301	11,463
Accrued expenses and other current liabilities	27,872	28,314
Operating lease liabilities	17,009	0
Liability for early exercise of unvested stock options	12,006	13,263
Deferred revenue	37,096	30,843
Total current liabilities	108,284	83,883
Build-to-suit lease financing obligation	0	10,506
Operating lease liabilities, noncurrent	33,795	0
Deferred revenue, noncurrent	996	804
Other noncurrent liabilities	9,104	9,803
Total liabilities	152,179	104,996
Commitments and contingencies (Note 7)
Stockholders’ Equity:
Additional paid-in capital	1,038,544	1,027,179
Accumulated deficit	(333,896)	(301,706)
Accumulated other comprehensive income	1,407	61
Total stockholders’ equity	706,352	725,828
Total liabilities and stockholders’ equity	858,531	830,824
Class A common stock
Stockholders’ Equity:
Common stock	$ 154	$ 87
Common stock, shares authorized (in shares)	2,250,000,000	2,250,000,000
Class B common stock
Stockholders’ Equity:
Common stock	$ 143	$ 207
Common stock, shares authorized (in shares)	315,000,000	315,000,000