Share-Based Compensation Arrangement by Share-Based Payment Award, Award Payout Percentage

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Conversion Ratio

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Increase In Number Of Shares Available For Grant, Percentage Of Shares Outstanding

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- Definition

Share-Based Compensation Arrangement By Share-based Payment Award, Maximum Shares Issuable

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Milestone Achievement Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number Of Tranches

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number Of Tranches Forfeited

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number Of Tranches Outstanding

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- Definition

Share-Based Payment Arrangement, Reversal Of Expense

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No definition available.

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- Definition

Share Repurchase Program, Offering Period Occurrence

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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No definition available.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- 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.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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Purchase price of common stock expressed as a percentage of its fair value.

+ References

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- Definition

Number of shares remaining authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Stock-Based Compensation - Narrative (Details)							1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
Stock-Based Compensation - Narrative (Details)	Jan. 01, 2026 shares	Mar. 26, 2024	Jul. 13, 2023 USD ($) tranche shares	Apr. 14, 2022 shares	Sep. 16, 2021 tranche shares	Sep. 15, 2021 shares	Jun. 30, 2022	Aug. 31, 2021 shares	Jun. 30, 2026 USD ($) tranche shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2026 USD ($) tranche shares	Jun. 30, 2025 USD ($) shares	Dec. 31, 2024 shares	Jun. 01, 2026 $ / shares	May 15, 2026 $ / shares	Feb. 09, 2026 $ / shares	Dec. 31, 2025 shares	Jun. 10, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									$ 85,600,000	$ 51,800,000	$ 156,000,000.0	$ 81,900,000
Granted (in shares)									0	0	0	0
Stock-based compensation expense \| $											$ 156,000,000.0	$ 81,900,000
Hawthorne Airport Acquisition \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $									$ 3,500,000		6,000,000.0
Vendor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									32,000,000.0	$ 15,900,000	64,900,000	22,400,000
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									41,200,000	22,900,000	73,300,000	34,000,000.0
Location, Statement of Income, Balance [Axis]: achr:GeneralAndAdministrativeExpenseCredit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									44,400,000	28,900,000	82,700,000	47,900,000
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									100,000	500,000		1,100,000
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $									0		0
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									40,700,000	28,400,000	65,200,000	44,800,000
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $									$ 248,300,000		$ 248,300,000
Issued (in shares)					20,009,224						27,057,890
Milestone achievement period					7 years
Vested (in shares)											11,627,479
Forfeited (in shares)											1,722,075
Shares outstanding (in shares)									47,778,421		47,778,421						34,166,124
Founder grants, number of tranches \| tranche					4
Weighted-average period											1 year
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Stock price (in dollars per share) \| $ / shares															$ 6.05	$ 7.37
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding stock maximum								1.00%
Total stock-based compensation expense \| $									$ 1,300,000	1,100,000	$ 2,600,000	2,000,000.0
Purchase price of common stock, percent								85.00%
Number of additional shares authorized (in shares)								9,938,118
Offering period occurrence								6 months
Unvested stock options \| $									1,800,000		1,800,000
Stock price (in dollars per share) \| $ / shares														$ 6.84
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of employees' gross pay								15.00%
Class B \| Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									$ 0	700,000	$ 1,800,000	2,600,000
Award vesting period (in years)			15 months
Vested (in shares)						10,004,612
Forfeited (in shares)				5,002,306									5,002,306
Shares outstanding (in shares)			15,006,918
Number of tranches forfeited \| tranche			3
Share-based payment arrangement, reversal of expense \| $			$ 59,100,000
Outstanding number of shares (in shares)									10,004,612		10,004,612
Number of tranches outstanding \| tranche									2		2
2021 Stock Plan \| Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)											21,900,711
2021 Stock Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (in shares)	37,202,288																	34,175,708
Percentage of outstanding stock maximum							5.00%
Annual Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $									$ 8,200,000	$ 5,200,000	$ 15,500,000	$ 9,000,000.0
Amended and Restated 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio											1
Amended and Restated 2021 Plan \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)											1 year
Amended and Restated 2021 Plan \| Quarterly Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio											1
Amended and Restated 2021 Plan \| Unvested restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)											3 years
Amended and Restated 2021 Plan \| Unvested restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)											4 years
Amended and Restated 2021 Plan \| Unvested restricted stock units \| Quarterly Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)											3,061,526
Amended and Restated 2021 Plan \| Unvested restricted stock units \| Based on Company’s Relative Performance of Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)											2,095,653
Award vesting period (in years)											3 years
Amended and Restated 2021 Plan \| Performance Stock Units \| Based on Company’s Relative Performance of Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio											1
Amended and Restated 2021 Plan \| Performance Stock Units \| Based on Company’s Relative Performance of Total Shareholder Return \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout range percentage											0.00%
Amended and Restated 2021 Plan \| Performance Stock Units \| Based on Company’s Relative Performance of Total Shareholder Return \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout range percentage											200.00%
2021 Employee Stock Purchase Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	7,440,457
Number of shares authorized (in shares)									23,203,452		23,203,452
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares)									18,196,893		18,196,893