Income taxes.

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Research tax credit carry forward expiration dates .

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Tax credit carry forward expiration year.

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Unrecognized tax benefits of deferred tax accounting that would not impact annual effective rate.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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Tax year being audited in the income tax examination, in CCYY format.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Provision for income taxes	$ 26,698,000	$ 13,039,000	$ 9,404,000
Deferred Tax Assets Valuation Allowance	1,022,705,000	668,432,000
Increase in valuation on deferred taxes	354,300,000
Deferred tax assets, net	731,463,000	190,469,000
Research and development credits	208,499,000	73,068,000
Deferred tax liability	0
Unrecognized tax benefits, that would not affect effective tax rate	198,300,000
SolarCity [Member]
Income Taxes [Line Items]
Increase in valuation on deferred taxes	169,300,000
Foreign jurisdictions [Member]
Income Taxes [Line Items]
Deferred tax assets, net	33,100,000
Federal [Member]
Income Taxes [Line Items]
Operating loss carry-forwards		4,340,000,000
Operating loss carry-forwards, related to stock options benefits recorded as additional paid-in capital	$ 2,390,000,000
Operating loss carry-forwards beginning to expire in the year	Dec. 31, 2024
Research and development credits		153,000,000
Research and development tax credits, federal carry-forwards expiration date	2024
General business tax credit		105,500,000
General business tax credits, beginning to expire in the year	2033
Federal [Member] \| Minimum [Member]
Income Taxes [Line Items]
Income tax examination, years	2003
Federal [Member] \| Maximum [Member]
Income Taxes [Line Items]
Income tax examination, years	2015
State [Member]
Income Taxes [Line Items]
Operating loss carry-forwards		3,010,000,000
Operating loss carry-forwards, related to stock options benefits recorded as additional paid-in capital	$ 1,420,000,000
Operating loss carry-forwards beginning to expire in the year	Dec. 31, 2017
Research and development credits		$ 163,600,000
California \| Minimum [Member]
Income Taxes [Line Items]
Income tax examination, years	2003
California \| Maximum [Member]
Income Taxes [Line Items]
Income tax examination, years	2015
U.S. and foreign jurisdictions [Member] \| Minimum [Member]
Income Taxes [Line Items]
Income tax examination, years	2007
U.S. and foreign jurisdictions [Member] \| Maximum [Member]
Income Taxes [Line Items]
Income tax examination, years	2015