Debt Instrument, percentage.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, Settled amount.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Discount on issue of warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	lazr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum Liquidity amount.

+ References

No definition available.

+ Details

Name:	lazr_MinimumLiquidityAmount
Namespace Prefix:	lazr_
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Balance Type:	debit
Period Type:	duration

- Definition

Minuimum Equity investment.

+ References

No definition available.

+ Details

Name:	lazr_MinuimumEquityInvestment
Namespace Prefix:	lazr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Payment of Upfront fees.

+ References

No definition available.

+ Details

Name:	lazr_PaymentOfUpfrontFees
Namespace Prefix:	lazr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

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

+ References

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Period Type:	instant

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

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

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Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

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

+ References

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the required periodic payments applied to interest.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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- Definition

The effective interest rate during the reporting period.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maturity date of long-term debt, in CCYY-MM-DD format.

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- Definition

The cash outflow for loan and debt issuance costs.

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- Definition

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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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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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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Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

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Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Details) - USD ($)									1 Months Ended	5 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Aug. 20, 2020	Jun. 06, 2020	May 26, 2020	Apr. 08, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2018	Oct. 31, 2017	Dec. 31, 2018	Dec. 15, 2017	Oct. 16, 2018	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Apr. 22, 2020	Nov. 19, 2018	Jul. 31, 2017	Aug. 30, 2015
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 255,000,000
Effective Percentage Interest Rate														15.58%
Payment of Upfront fees														$ 108,000,000
Proceeds from Issuance of Warrants														46,000,000
Debt Instrument, Maturity Date												Sep. 18, 2020
Proceeds from the issuance of debt												$ 31,910,000		$ 0	$ 5,940,000
Debt instrument, Conversion price												$ 43.3039		$ 43.3039
Loss on extinguishment of debt												$ 866,000	$ 6,124,000	$ 6,124,000	0
Unamortized financing costs and discount												86,000,000		146,000
Debt Instrument carrying amount														9,492,000					$ 1,500,000
Payments of Financing Costs												361,000,000
Amortized of non-cash interest expense												235,000,000
Line of Credit Facility, Remaining Borrowing Capacity												1,400,000		1,400,000
Line of Credit Facility, Maximum Borrowing Capacity												5,400,000		5,400,000
Proceeds from Lines of Credit											$ 2,200,000
Debt instrument Settled amount														58,000,000	58,000,000
Newly issued Warrants														46,000,000
Line of credit outstanding current							$ 549,000		$ 549,000			52,000	$ 51,000	51,000	549,000
Amended Bridge Note [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Warrants												525,000,000
Loss on extinguishment of debt						$ 6,000,000.0
Debt Instrument, Interest Rate, Stated Percentage																			3.00%
Effective interest rate																			3.00%
Debt instrument Settled amount						$ 58,000,000
Newly issued Warrants												525,000,000
Long term debt maturity date																			Aug. 11, 2016
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Warrants												253,000,000
Short-term Debt, Refinanced, Amount												55,000,000
Newly issued Warrants												253,000,000
Vehicle loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 73,000
Line of Credit Facility, Interest Rate During Period								5.99%
Long term debt maturity date								Nov. 10, 2022
Debt instrument frequency of periodic payment								60 monthly
Debt instrument date of first required payment								Dec. 10, 2017
Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 182,000		$ 182,000						$ 182,000
Line of Credit Facility, Interest Rate During Period							5.89%
Long term debt maturity date							Nov. 14, 2023		Nov. 14, 2023						Nov. 14, 2023
Debt instrument frequency of periodic payment							60 monthly installments
Debt instrument date of first required payment							Nov. 14, 2018
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity																	$ 500,000
Line of credit outstanding current							$ 500,000,000		$ 500,000,000						$ 500,000,000
Revolving Credit Facility [Member] \| Wall Street Journal [Member]
Debt Instrument [Line Items]
Debt instrument description of variable interest rate spread									prime rate (Index)
Equipment and Loan Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument carrying amount							3,957,000		$ 3,957,000					1,281,000	3,957,000
Line of Credit Facility, Current Borrowing Capacity												4,000,000		4,000,000.0
Debt Instrument, Interest Rate, Stated Percentage																		10.35%
Effective interest rate																		10.35%
Equipment and Loan Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Effective Percentage Interest Rate																		13.96%
Equipment and Loan Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Effective Percentage Interest Rate																		10.37%
Equipment and Loan Agreement [Member] \| Three Promissory Note [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit										$ 3,200,000
Paycheck Protection Program Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal	$ 7,820,000
Debt Instrument, Interest Rate, Stated Percentage																1.00%
Effective interest rate																1.00%
Debt Instrument, Periodic Payment	7,840,000
Debt Instrument, Periodic Payment, Interest	$ 26,000,000
Paycheck Protection Program Note [Member] \| Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount																$ 7,800,000
Equity investment option 1 [Member]
Debt Instrument [Line Items]
Minuimum Equity investment												25,000,000		25,000,000
Equity investment option 2 [Member]
Debt Instrument [Line Items]
Minuimum Equity investment												10,000,000		10,000,000
Equity investment option 3 [Member]
Debt Instrument [Line Items]
Minuimum Equity investment												30,000,000		$ 30,000,000
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal					$ 20,000,000							$ 5,000,000
Repayments of Debt			$ 3,000,000	$ 17,000,000
Twenty seventeen Note [Member]
Debt Instrument [Line Items]
Effective Percentage Interest Rate												15.68%		15.68%
Payment of Upfront fees												$ 382,000,000		$ 382,000,000
Proceeds from Issuance of Warrants												480,000,000		480,000,000
Minimum Liquidity amount														2,000,000.0
Debt Instrument, Annual Principal Payment					3,600,000
Debt Instrument carrying amount							11,648,000		11,648,000					5,304,000	11,648,000
Newly issued Warrants												480,000,000		480,000,000
Twenty seventeen Note [Member] \| Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 15,000,000		$ 15,000,000
Debt Instrument, Interest Rate												12.50%		12.50%
Twenty Eighteen Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 3,000,000
Debt Instrument, Interest Rate														12.50%
Effective Percentage Interest Rate												15.58%
Payment of Upfront fees												$ 108,000,000
Proceeds from Issuance of Warrants												46,000,000
Minimum Liquidity amount												2,000,000
Debt Instrument, Annual Principal Payment					$ 2,400,000
Debt Instrument carrying amount							$ 3,000,000		$ 3,000,000					$ 2,707,000	$ 3,000,000
Newly issued Warrants												46,000,000
Twenty Eighteen Notes [Member] \| Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 3,000,000
Debt Instrument, Interest Rate												12.50%
New Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate												12.50%		12.50%
Minimum Liquidity amount												$ 5,000,000		$ 5,000,000
Proceeds from the issuance of debt		$ 10,000,000
Debt Instrument,Term												48 months		48 months
Line of Credit Facility, Commitment Fee Percentage												1.50%		1.50%
Debt Instrument carrying amount												$ 30,000,000
Discount on issue of warrants												$ 1,200,000
New Notes [Member] \| Series A Convertible Preferred shares [Member]
Debt Instrument [Line Items]
Debt Instrument percentage												10.00%