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Business combination maximum percentage of outstanding capital stock.

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Common stock and temporary equity description of voting rights

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Debt Instrument, percentage.

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Exchange ratio for the temporary equity and stock exchanged with common stock.

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Minimum Liquidity amount.

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Minuimum Equity investment.

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Temporary equity issue price per share.

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Temporary equity share authorised amount.

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Amount of decrease (increase) in additional paid in capital (APIC) for the increase in carrying amount of redeemable preferred stock.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount of the total principal payments made during the annual reporting period.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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Fair value portion of warrants not settleable in cash classified as equity.

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Subsequent Events - Additional Information (Details)							1 Months Ended		9 Months Ended		12 Months Ended
Subsequent Events - Additional Information (Details)	Aug. 24, 2020 USD ($) $ / shares shares	Aug. 20, 2020 USD ($)	Jun. 06, 2020 USD ($)	May 26, 2020 USD ($)	Apr. 08, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Jul. 31, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Aug. 22, 2020	Apr. 22, 2020 USD ($)	Mar. 20, 2020 USD ($) $ / shares shares	Jun. 24, 2019 $ / shares
Common Stock, Value											$ 0	$ 0
Debt Instrument, Face Amount							$ 255,000,000		$ 255,000,000
Proceeds from issuance of Series A Convertible Preferred stock											$ 68,666,000	0
Debt instrument, Conversion price \| $ / shares							$ 43.3039		$ 43.3039		$ 43.3039
Proceeds from the issuance of debt									$ 31,910,000		$ 0	$ 5,940,000
Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Periodic Payment, Principal						$ 20,000,000			5,000,000
Repayments of Debt				$ 3,000,000	$ 17,000,000
Equity investment option 1 [Member]
Minuimum Equity investment									25,000,000		25,000,000
Equity investment option 2 [Member]
Minuimum Equity investment									10,000,000		10,000,000
Equity investment option 3 [Member]
Minuimum Equity investment									$ 30,000,000		$ 30,000,000
New Notes [Member]
Line of Credit Facility, Commitment Fee Percentage									1.50%		1.50%
Debt Instrument,Term									48 months		48 months
Debt Instrument, Interest Rate									12.50%		12.50%
Proceeds from the issuance of debt			$ 10,000,000
Minimum Liquidity amount									$ 5,000,000		$ 5,000,000
Twenty seventeen Note [Member]
Minimum Liquidity amount											2,000,000.0
Debt Instrument, Annual Principal Payment						3,600,000
Twenty Eighteen Notes [Member]
Debt Instrument, Face Amount											$ 3,000,000
Debt Instrument, Interest Rate											12.50%
Minimum Liquidity amount									2,000,000
Debt Instrument, Annual Principal Payment						$ 2,400,000
Paycheck Protection Program Note [Member]
Debt Instrument, Periodic Payment, Principal		$ 7,820,000
Debt Instrument, Interest Rate, Stated Percentage														1.00%
Silicon Valley Bank [Member] \| Paycheck Protection Program Note [Member]
Debt Instrument, Face Amount														$ 7,800,000
Subsequent Event [Member]
Debt instrument frequency of periodic payment						32 equal monthly installments
Subsequent Event [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Periodic Payment, Principal						$ 20,000,000.0
Repayments of Debt				$ 3,000,000	$ 17,000,000
Subsequent Event [Member] \| New Notes [Member]
Proceeds from the issuance of debt			$ 10,000,000
Subsequent Event [Member] \| Twenty seventeen Note [Member]
Debt Instrument, Annual Principal Payment						3,600,000
Subsequent Event [Member] \| Twenty Eighteen Notes [Member]
Debt Instrument, Annual Principal Payment						$ 2,400,000
Subsequent Event [Member] \| Paycheck Protection Program Note [Member]
Debt Instrument, Interest Rate, Stated Percentage													1.00%
Volvo Stock Purchase Warrant [Member]
Exercise price of warrants \| $ / shares															$ 43.3039
Fair value of warrants							$ 2,900,000		$ 2,900,000
Luminar [Member]
Maximum percentage of outstanding capital stock							7.50%		7.50%
Series X Preferred Stock [Member]
Additional issue of shares \| shares							102,101		102,101
Total gross proceeds of share issued									$ 13,860,000
Series X Preferred Stock [Member] \| Luminar [Member]
Share price \| $ / shares							$ 10.00		$ 10.00
Common Stock, Value							$ 2,943,000,000		$ 2,943,000,000
Maximum aggregate amount of additional capital raised							$ 13,900,000		13,900,000
Increase in preferred stock									$ 170,000,000
Common Class A [Member]
Common Stock, Shares \| shares							9,763,078		9,763,078		9,880,277	9,593,220
Common Stock, Value							$ 0		$ 0		$ 0
Common Class A [Member] \| Luminar [Member]
Common Stock, Shares \| shares							218,818,037		218,818,037
Common Class B [Member]
Common Stock, Shares \| shares							0		0		0
Common Stock, Value							$ 0		$ 0		$ 0
Common stock voting rights									ten votes
Common Class B [Member] \| Subsequent Event [Member] \| Chief Executive Officer [Member]
Common stock voting rights	ten votes
Exchange ratio for the temporary equity and stock exchanged with common stock	10
Common Class B [Member] \| Luminar [Member]
Common Stock, Shares \| shares							105,118,203		105,118,203
Common Class A And Class B [Member] \| Luminar [Member]
Common Stock, Shares \| shares							25,818,749		25,818,749
Series A Redeemable Convertible Preferred Stock
Temporary equity par or stated value per share \| $ / shares							$ 0.00001		$ 0.00001		$ 0.00001	$ 0.00001				$ 0.00001
Temporary equity issued during the period shares \| shares								244,827		1,585,674	1,585,674
Proceeds from issuance of Series A Convertible Preferred stock								$ 10,100,000		$ 68,666,000
Series A Redeemable Convertible Preferred Stock \| New Notes [Member]
Debt Instrument percentage											10.00%
Series A Redeemable Convertible Preferred Stock \| Volvo Stock Purchase Warrant [Member]
Class of warrants or rights number of securities called by warrants or rights \| shares															300,000
Temporary equity par or stated value per share \| $ / shares															$ 0.00001
Series A Redeemable Convertible Preferred Stock \| Volvo Stock Purchase Warrant [Member] \| Volvo Car Technology Fund [Member] \| Subsequent Event [Member]
Class of warrants or rights number of securities called by warrants or rights \| shares															300,000
Temporary equity par or stated value per share \| $ / shares															$ 0.00001
Exercise price of warrants \| $ / shares															$ 43.3039
Series A Redeemable Convertible Preferred Stock \| Future Reduction In Revenue [Member] \| Volvo Stock Purchase Warrant [Member] \| Volvo Car Technology Fund [Member] \| Subsequent Event [Member]
Fair value of warrants															$ 2.9
Founders Convertible Preferred And Luminar Class A Common Stock [Member] \| Subsequent Event [Member] \| Chief Executive Officer [Member]
Common stock and temporary equity voting rights	one vote
Series X Redeemable Convertible Preferred Stock
Temporary equity par or stated value per share \| $ / shares	$ 0.00001						$ 0.00001		$ 0.00001		$ 0.00001
Temporary equity issued during the period shares \| shares							1,251,971		1,251,971
Temporary equity issue price per share \| $ / shares	$ 135.79
Proceeds from issuance of Series A Convertible Preferred stock							$ 170,000,000		$ 170,000,000		$ 170,000,000
Series X Redeemable Convertible Preferred Stock \| Subsequent Event [Member]
Temporary equity issued during the period shares \| shares	1,250,000
Temporary equity issue price per share \| $ / shares	$ 135.8
Series X Redeemable Convertible Preferred Stock \| Subsequent Event [Member] \| Additional Authorization [Member]
Temporary equity shares authorised amount	$ 30,000,000