XML 97 R67.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) purchase_period $ / shares shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | May 31, 2021 shares
Stockholders Equity Note [Line Items] |  |  |  |  |
Stock-based compensation, income tax benefit | $ |  | $ 17,100 | $ 14,900 | $ 13,800 |
Stock-based compensation expense | $ |  | $ 154,026 | 133,367 | 114,336 |
Restricted Stock Units (RSUs) |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Restricted stock units, shares vested and released (shares) |  | 201,358 |  |  |
Restricted stock units, shares withheld for tax payments |  | 61,267 |  |  |
Restricted stock units, net issuance (in shares) |  | 140,091 |  |  |
Vested in period, Fair value | $ |  | $ 63,000 | $ 93,700 | $ 158,800 |
Weighted average grant date fair value of awards granted (usd per share) | $ / shares |  | $ 316.16 | $ 469.12 | $ 600.10 |
Total unamortized compensation cost | $ | $ 174,300 | $ 174,300 |  |  |
Weighted average period of total unamortized cost |  | 2 years 7 months 6 days |  |  |
Awards granted (in shares) |  | 509,000 |  |  |
Market Performance Based Restricted Stock Units |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted stock units, shares vested and released (shares) |  | 24,578 |  |  |
Restricted stock units, shares withheld for tax payments |  | 10,480 |  |  |
Restricted stock units, net issuance (in shares) |  | 14,098 |  |  |
Vested in period, Fair value | $ |  | $ 7,800 | $ 64,000 | $ 135,600 |
Weighted average grant date fair value of awards granted (usd per share) | $ / shares |  | $ 629.53 |  |  |
Total unamortized compensation cost | $ | $ 47,500 | $ 47,500 |  |  |
Weighted average period of total unamortized cost |  | 1 year 4 months 24 days |  |  |
Percentage of market-performance based restricted stock units eligible to vest over the vesting period |  | 250.00% |  |  |
Awards granted (in shares) |  | 82,000 |  |  |
Restricted Stock Units with Performance Conditions (PSUs) |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Vesting period | 2 years 2 months 12 days |  |  |  |
Weighted average grant date fair value of awards granted (usd per share) | $ / shares | $ 201.63 |  |  |  |
Awards granted (in shares) | 4,728 |  |  |  |
Stock Incentive Plan 2005 |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Share award ratio | 1.9 | 1.9 |  |  |
Number of shares reserved for issuance (in shares) | 32,168,895 | 32,168,895 |  |  |
Number of shares available for grant (shares) | 4,796,559 | 4,796,559 |  |  |
Employee Stock Purchase Plan |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Number of shares available for grant (shares) | 1,995,453 | 1,995,453 |  |  |
Total unamortized compensation cost | $ | $ 6,800 | $ 6,800 |  |  |
Weighted average period of total unamortized cost |  | 7 months 6 days |  |  |
ESPP offering period |  | 24 months |  |  |
Number of offering periods | purchase_period |  | 4 |  |  |
Purchase period |  | 6 months |  |  |
Purchase price of shares, percent of fair market value |  | 85.00% |  |  |
Number of shares reserved for issuance (in shares) |  |  |  |  | 4,400,000
Stock-based compensation expense | $ |  | $ 20,500 | $ 23,500 | $ 12,200 |

X
- Definition Employee Stock Purchase Plan, Duration Of Offering Period + References No definition available. + Details
Name: | algn_EmployeeStockPurchasePlanDurationOfOfferingPeriod
Namespace Prefix: | algn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee Stock Purchase Plan, Number Of Six Month Purchasing Periods + References No definition available. + Details
Name: | algn_EmployeeStockPurchasePlanNumberOfSixMonthPurchasingPeriods
Namespace Prefix: | algn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of market-performance based restricted stock units during vesting period. + References No definition available. + Details
Name: | algn_PercentageOfMarketPerformanceBasedRestrictedStockUnitsDuringVestingPeriod
Namespace Prefix: | algn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restricted Stock Units, Shares Issued Net of Shares for Tax Withholdings + References No definition available. + Details
Name: | algn_RestrictedStockUnitsSharesIssuedNetOfSharesForTaxWithholdings
Namespace Prefix: | algn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period + References No definition available. + Details
Name: | algn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod
Namespace Prefix: | algn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Weight Of Awarded Shares Against Authorized Maximum + References No definition available. + Details
Name: | algn_SharebasedCompensationArrangementbySharebasedPaymentAwardWeightOfAwardedSharesAgainstAuthorizedMaximum
Namespace Prefix: | algn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stockholders Equity Note [Line Items] + References No definition available. + Details
Name: | algn_StockholdersEquityNoteLineItems
Namespace Prefix: | algn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=algn_MarketPerformanceBasedRestrictedStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=algn_StockIncentivePlan2005Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=algn_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |