CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 525,693	$ 170,281
Short-term marketable securities	0	242,000
Accounts receivable (net of allowance for doubtful accounts of $11,707 and $7,686 at June 30, 2020 and December 31, 2019, respectively)	72,025	106,832
Prepaid expenses and other current assets	19,675	14,196
Total current assets	617,393	533,309
Long-term marketable securities	0	53,499
Property, equipment and software, net	106,732	110,949
Operating lease right-of-use assets	188,266	197,866
Goodwill	104,796	104,589
Intangibles, net	8,733	10,082
Restricted cash	910	22,037
Other non-current assets	46,655	38,369
Total assets	1,073,485	1,070,700
Current liabilities:
Accounts payable and accrued liabilities	60,206	72,333
Operating lease liabilities — current	56,406	57,507
Deferred revenue	3,918	4,315
Total current liabilities	120,530	134,155
Operating lease liabilities — long-term	164,537	174,756
Other long-term liabilities	7,098	6,798
Total liabilities	292,165	315,709
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.000001 par value, 200,000,000 shares authorized – 73,121,229 and 71,185,468 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	0	0
Additional paid-in capital	1,325,745	1,259,803
Accumulated other comprehensive loss	(11,845)	(11,759)
Accumulated deficit	(532,580)	(493,053)
Total stockholders' equity	781,320	754,991
Total liabilities and stockholders' equity	$ 1,073,485	$ 1,070,700