Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 2,130,000		$ 2,130,000		$ 1,930,000
Deferred revenue recognized out of prior period balance				157,000	$ 149,000
Deferred revenue recognized in next 12 months				$ 1,320,000
Performance period of vehicles description				expected ownership life of the vehicle or the eight-year life of the vehicle.
Total sales return reserve from buyback options		592,000		$ 592,000		703,000
Sales return reserve from short term buyback options		215,000		215,000		202,000
Deferred revenue		1,693,000		1,693,000		1,458,000
Unrecognized tax benefits		396,000		396,000		380,000
Unrecognized tax benefits, that would not affect effective tax rate		357,000		357,000		353,000
Increase in net loss attributable to common stockholders		2,000		6,000
Allowance for credit losses		45,000		45,000		45,000
MyPower customer notes receivable, net of allowance for credit losses		315,000		315,000		334,000
MyPower customer notes receivable, net of allowance for credit losses, current		11,000		$ 11,000		$ 9,000
Accounts receivable from OEM customers excess percentage				10.00%		10.00%
Gross cost of operating lease vehicles		4,340		$ 4,340		$ 3,540,000
Net accumulated depreciation related to leased vehicles		595,000		595,000		$ 446,000
Decrease In Net Interest Expense		$ 46,000		$ 191,000
Increase in Basic Net Income Per Share of Common Stock Attributable to Company | $ / shares		$ 0.05		$ 0.20
Increase in Diluted Net Income Per Share of Common Stock Attributable to Company | $ / shares		$ 0.04		$ 0.18
Sales-type leasing revenue		$ 55,000		$ 97,000
Sales-type leasing cost of revenue		$ 36,000		62,000
Purchases of digital assets, amount				$ 1,500,000
Earnings Per Share Diluted | $ / shares	[1]	$ 1.02	$ 0.10	$ 1.41	$ 0.12
Stock split ratio				5
Stock split description				five-for-one stock split effected in the form of a stock dividend in August 2020
Federal [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2004
Federal [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2019
California [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2004
California [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2019
U.S. and foreign jurisdictions [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2008
U.S. and foreign jurisdictions [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2020
IRS [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2015
IRS [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax examination, years				2018
Shanghai, China [Member]
Summary Of Significant Accounting Policies [Line Items]
Corporate income tax rate to certain enterprises				15.00%
Corporate income tax rate				25.00%
Beneficial income tax rate				15.00%
Cumulative Effect Period Of Adoption Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Earnings Per Share Diluted | $ / shares				$ 0.01
1.25% Convertible Senior Notes due in 2021 (2021 Notes) [Member] | Recourse debt [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest Rate		1.25%		1.25%		1.25%
Maturity year				2021
2.375% Convertible Senior Notes due in 2022 [Member] | Recourse debt [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest Rate		2.375%		2.375%		2.375%
Maturity year				2022
2.00% Convertible Senior Notes due in 2024 [Member] | Recourse debt [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest Rate		2.00%		2.00%		2.00%
Maturity year				2024
5.50% Convertible Senior Notes due in 2022 [Member] | Recourse debt [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest Rate		5.50%		5.50%
Maturity year				2022
Customer payments [Member] | Energy Generation and Storage [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 217,000		$ 217,000		$ 187,000
Deferred revenue recognized in next 12 months				8,000
Revenue recognized				66,000	$ 28,000
Unbilled transaction price allocated to performance obligations, expected of more than one year		149,000		$ 149,000
Solar Energy Systems [Member]
Summary Of Significant Accounting Policies [Line Items]
Product warranty description				a warranty on the installation and components of the energy generation and storage systems we sell for periods typically between 10 to 25 years.
Automotive Regulatory Credits [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue recognized out of prior period balance				$ 140,000	$ 140,000
Deferred revenue		$ 42,000		$ 42,000		$ 21,000
Deferred revenue, recognition period				12 months

[1] Prior period results have been adjusted to reflect the five-for-one stock split effected in the form of a stock dividend in August 2020.