CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 364,576	$ 170,281
Short-term marketable securities	122,618	242,000
Accounts receivable (net of allowance for doubtful accounts of $14,588 and $7,686 at March 31, 2020 and December 31, 2019, respectively)	85,875	106,832
Prepaid expenses and other current assets	21,804	14,196
Total current assets	594,873	533,309
Long-term marketable securities	3,500	53,499
Property, equipment and software, net	110,141	110,949
Operating lease right-of-use assets	199,053	197,866
Goodwill	103,976	104,589
Intangibles, net	9,304	10,082
Restricted cash	22,332	22,037
Other non-current assets	42,045	38,369
Total assets	1,085,224	1,070,700
Current liabilities:
Accounts payable and accrued liabilities	74,702	72,333
Operating lease liabilities — current	62,342	57,507
Deferred revenue	3,637	4,315
Total current liabilities	140,681	134,155
Operating lease liabilities — long-term	175,073	174,756
Other long-term liabilities	7,038	6,798
Total liabilities	322,792	315,709
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.000001 par value, 200,000,000 shares authorized – 71,887,846 and 71,185,468 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	0	0
Additional paid-in capital	1,283,885	1,259,803
Accumulated other comprehensive loss	(12,863)	(11,759)
Accumulated deficit	(508,590)	(493,053)
Total stockholders' equity	762,432	754,991
Total liabilities and stockholders' equity	$ 1,085,224	$ 1,070,700