Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

U.S. and Foreign Components of Loss Before Income Taxes

The components of the provision for income taxes for the periods indicated are as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
United States	$	(2,600,858)	$	(900,642)	$	(687,743)
Foreign	973		(9,955)		(2)
Loss before income taxes	$	(2,599,885)	$	(910,597)	$	(687,745)

Components of Provision for Income Taxes

The provision for income taxes for the periods indicated are as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Current provision
Federal	$	—	$	—	$	—
State	2,704		1,250		556
Foreign	1,901		116		—
Total current	$	4,605	$	1,366	$	556
Deferred provision
Federal	(269)		—		—
State	(891)		—		—
Foreign	(1,089)		(628)		—
Total deferred	(2,249)		(628)		—
Total provision for income taxes	$	2,356	$	738	$	556

Reconciliation of Statutory Federal Income Tax Rate to the Effective Rate

A reconciliation of the U.S. federal statutory income tax rates to the Company’s effective tax rate is as follows:

	Year Ended December 31,
	2019		2018		2017
Provision at federal statutory rate	21.0	%	21.0	%	34.0	%
State, net of federal benefit	7.6		6.0		3.7
Permanent tax adjustments	(0.4)		(0.8)		(0.6)
Federal statutory tax rate change	—		—		(34.8)
Stock-based compensation	9.9		0.8		(0.2)
Change in valuation allowance	(38.1)		(27.6)		(2.3)
Other adjustments	(0.2)		0.5		0.1
Provision for income taxes	(0.2)	%	(0.1)	%	(0.1)	%

Schedule of Deferred Tax Assets and Liabilities

The significant components of the Company’s deferred tax assets and liabilities as of the periods indicated were as follows (in thousands):

	December 31,
	2019		2018
Net operating loss carryforward	$	1,173,732	$	475,823
Insurance reserves	391,250		239,401
Accrued and other liabilities	369,018		83,187
Total deferred tax assets	1,934,000		798,411
State income taxes	(92,585)		(39,902)
Operating lease right of use asset	(88,376)		—
Total deferred tax liabilities	(180,961)		(39,902)
Net deferred tax asset	1,753,039		758,509
Less: Valuation allowance	(1,751,118)		(761,728)
Net deferred tax asset (liability)	$	1,921	$	(3,219)

Summary of Rollforward of Valuation Allowance

A reconciliation of the valuation allowance is as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Beginning balance	$	761,728	$	507,274	$	491,356
Net changes in deferred tax assets and liabilities	989,390		254,454		15,918
Ending balance	$	1,751,118	$	761,728	$	507,274