CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 590,789	$ 170,281
Short-term marketable securities	0	242,000
Accounts receivable (net of allowance for doubtful accounts of $11,316 and $7,686 at September 30, 2020 and December 31, 2019, respectively)	84,813	106,832
Prepaid expenses and other current assets	18,590	14,196
Total current assets	694,192	533,309
Long-term marketable securities	0	53,499
Property, equipment and software, net	105,488	110,949
Operating lease right-of-use assets	176,603	197,866
Goodwill	106,772	104,589
Intangibles, net	14,240	10,082
Restricted cash	826	22,037
Other non-current assets	40,829	38,369
Total assets	1,138,950	1,070,700
Current liabilities:
Accounts payable and accrued liabilities	103,378	72,333
Operating lease liabilities — current	54,396	57,507
Deferred revenue	4,731	4,315
Total current liabilities	162,505	134,155
Operating lease liabilities — long-term	155,297	174,756
Other long-term liabilities	5,520	6,798
Total liabilities	323,322	315,709
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.000001 par value, 200,000,000 shares authorized – 73,976,487 and 71,185,468 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	0	0
Additional paid-in capital	1,358,804	1,259,803
Accumulated other comprehensive loss	(9,576)	(11,759)
Accumulated deficit	(533,600)	(493,053)
Total stockholders' equity	815,628	754,991
Total liabilities and stockholders' equity	$ 1,138,950	$ 1,070,700