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Debt - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 5 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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% |  |  |  |  |  |  |

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- Definition Debt Instrument, percentage. + References No definition available. + Details
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Namespace Prefix: | lazr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt instrument, Settled amount. + References No definition available. + Details
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Namespace Prefix: | lazr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- Definition Minimum Liquidity amount. + References No definition available. + Details
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Namespace Prefix: | lazr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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