Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 597,889	$ 358,319
Short-term investments	2,071,991	2,491,805
Prepaid expenses and other current assets	474,874	397,239
Total current assets	3,144,754	3,247,363
Restricted cash and cash equivalents	529,091	204,976
Restricted investments	940,827	1,361,045
Other investments	10,000	0
Property and equipment, net	360,546	188,603
Operating lease right-of-use assets	307,774	441,258
Intangible assets, net	88,744	82,919
Goodwill	180,590	158,725
Other assets	9,432	6,494
Total assets	5,571,758	5,691,383
Current liabilities
Accounts payable	540,495	38,839
Insurance reserves	975,132	1,378,462
Accrued and other current liabilities	991,386	939,865
Operating lease liabilities — current	44,127	94,199
Total current liabilities	2,551,140	2,451,365
Operating lease liabilities	305,851	382,077
Long-term debt, net of current portion	82,141	0
Other liabilities	25,137	3,857
Total liabilities	2,964,269	2,837,299
Commitments and contingencies (Note 7)
Stockholders’ equity
Preferred stock, $0.00001 par value; 1,000,000,000 shares authorized as of March 31, 2020 and December 31, 2019; no shares issued and outstanding as of March 31, 2020 and December 31, 2019	0	0
Common stock, $0.00001 par value; 18,000,000,000 Class A shares authorized as of March 31, 2020 and December 31, 2019; 297,989,705 and 293,793,151 Class A shares issued and outstanding, as of March 31, 2020 and December 31, 2019, respectively; 100,000,000 Class B shares authorized, 8,802,629 Class B shares issued and outstanding, as of March 31, 2020 and December 31, 2019	3	3
Additional paid-in capital	8,554,471	8,398,927
Accumulated other comprehensive income (loss)	(1,341)	2,725
Accumulated deficit	(5,945,644)	(5,547,571)
Total stockholders’ equity	2,607,489	2,854,084
Total liabilities and stockholders’ equity	5,571,758	5,691,383
Long-term debt, net of current portion	$ 82,141	$ 0
Preferred stock shares authorized (in shares)	1,000,000,000	1,000,000,000