XML 29 R2.htm IDEA: XBRL DOCUMENT
v3.23.1

Pay vs Performance Disclosure - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | PAY VERSUS PERFORMANCE We are providing the following information about the relationship between “compensation actually paid” to our named executive officers and company financial performance, as required by or defined in Section 953(a) of the Dodd-Frank Act and Item 402(v) of Regulation S-K. For further information regarding our compensation philosophy, and in particular, how we align executive compensation with company financial performance, refer to “Executive Compensation – Compensation Discussion and Analysis,” above.
|  |  |  |  |  |  |  |  |  |  |  |  |  | Value of Initial Fixed $100 Investment Based On: |  |  |  |  |  |  |
Fiscal Year |  | Summary Compensation Table Total for PEO ($)(1) |  |  | Compensation Actually Paid to PEO ($)(2) |  |  | Average Summary Compensation Table Total for Non-PEO NEOs ($)(3) |  |  | Average Compensation Actually Paid to Non-PEO NEOs ($)(4) |  |  | Total Shareholder Return – AMBA ($)(5) |  |  | Peer Group Total Shareholder Return ($)(6) |  |  | Net Income ($ Millions) (7) |  |  | Revenue ($ Millions) (8) |
2023 |  |  | 5,904,850 |  |  |  | (5,223,250 | ) |  |  | 3,702,220 |  |  |  | (483,113 | ) |  |  | 151.91 |  |  |  | 180.82 |  |  |  | (65.4 | ) |  |  | 337.6 |
2022 |  |  | 6,205,867 |  |  |  | 21,197,673 |  |  |  | 2,592,611 |  |  |  | 9,835,394 |  |  |  | 236.98 |  |  |  | 209.94 |  |  |  | (26.4 | ) |  |  | 331.9 |
2021 |  |  | 5,596,549 |  |  |  | 14,765,032 |  |  |  | 2,212,215 |  |  |  | 5,755,522 |  |  |  | 159.55 |  |  |  | 170.15 |  |  |  | (59.8 | ) |  |  | 222.9 |
(1) | The dollar amounts reported in this column are the amounts of total compensation reported for the Company’s principal executive officer, or PEO, Dr. Feng-Ming (Fermi) Wang, for each corresponding fiscal year in the “Total” column of the Summary Compensation Table. Refer to “Executive Compensation – Summary Compensation Table for Fiscal Year 2023,” above.
(2) | Compensation actually paid does not mean that our PEO was actually paid those amounts in the listed fiscal year, but this is a dollar amount derived from the starting point of the compensation reported in the “Total” column of the Summary Compensation Table, under the methodology prescribed under the SEC’s rules, as shown in the reconciliation table b elow.
The following table presents a reconciliation of total compensation paid to the PEO for each year as reported in the Summary Compensation Table, above, to the compensation actually paid to the PEO, which was computed in accordance with Item 402(v) of Regulation S-K, as reported in the Pay versus Performance table, above.
Fiscal Year |  | Summary Compensation Table Total for PEO ($) |  |  | Exclusion of Stock Awards for PEO ($) |  |  | Inclusion of Equity Values for PEO ($) |  |  | Equals Compensation Actually Paid to PEO($) |
2023 |  |  | 5,904,850 |  |  |  | (5,343,850 | ) |  |  | (5,784,250 | ) |  |  | (5,223,250 | )
2022 |  |  | 6,205,867 |  |  |  | (4,905,867 | ) |  |  | 19,897,673 |  |  |  | 21,197,673 |
2021 |  |  | 5,596,549 |  |  |  | (4,717,849 | ) |  |  | 13,886,332 |  |  |  | 14,765,032 |
The amounts in the Inclusion of Equity Values for PEO column in the table above are derived from the amounts set forth in the following table:
Fiscal Year |  | Fair Value of Unvested Current Year Awards at FYE for PEO ($) |  |  | Change in Value of Prior Year Awards Vesting During the Year for PEO ($) |  |  | Change in Value of Unvested Equity from Prior Years for PEO ($) |  |  | Adjust for Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year for PEO ($) |  |  | Fair Value at Last Day of Prior Year of Equity Awards Forefeited during Year for PEO ($) |  |  | Total- Inclusion of Equity Values for PEO ($) |
2023 |  |  | 4,221,283 |  |  |  | (1,451,046 | ) |  |  | (9,054,092 | ) |  |  | 499,604 |  |  |  | — |  |  |  | (5,784,250 | )
2022 |  |  | 5,627,028 |  |  |  | 1,909,656 |  |  |  | 11,606,228 |  |  |  | 754,761 |  |  |  | — |  |  |  | 19,897,673 |
2021 |  |  | 8,472,740 |  |  |  | 41,072 |  |  |  | 4,664,085 |  |  |  | 708,435 |  |  |  | — |  |  |  | 13,886,332 |
(3) | The dollar amounts reported in this column represent the average of the amounts reported for the Company’s NEOs other than the Company’s PEO (the “Non-PEO NEOs”), for each corresponding fiscal year in the “Total” column of the Summary Compensation Table. Refer to “Executive Compensation –Summary Compensation Table for Fiscal Year 2023” above and the Summary Compensation Tables for fiscal years 2022 and 2021 contained in the Company’s previously filed proxy statements. The non-PEO NEOs included for purposes of calculating the average amounts in each applicable year are as follows: (i) for fiscal year 2023, Les Kohn, Brian White, Chan Lee, John Ju, and John Young; (ii) for fiscal year 2022, Les Kohn, Casey Eichler, Chan Lee, John Ju, and John Young; and (iii) for fiscal year 2021, Les Kohn, Casey Eichler, Michael Chen, and Christopher Day.
(4) | This figure is the average of compensation actually paid for the Non-PEO NEOs in each listed fiscal year. Compensation actually paid does not mean that these Non-PEO NEOs were actually paid those amounts in the listed year, but this is a dollar amount derived from the starting point of Summary Compensation Table total compensation under the methodology prescribed under the SEC’s rules, as shown in the reconciliation table below.
The following table presents a reconciliation of average compensation paid to Non-PEO NEOs for each year as reported in the Summary Compensation Table above and in the Company’s previously filed proxy statements to the average compensation actually paid to the Non-PEO NEOs, which was computed in accordance with Item 402(v) of Regulation S-K, as reported in the Pay versus Performance table, above.
Fiscal Year |  | Average Summary Compensation Table Total for Non-PEO NEOs \($) |  |  | Average Exclusion of Stock Awards for Non-PEO NEOs($) |  |  | Average Inclusion of Equity Values for Non-PEO NEOs($) |  |  | Equals Average Compensation Actually Paid to Non-PEO NEOs ($) |
2023 |  |  | 3,702,220 |  |  |  | (3,324,397 | ) |  |  | (860,936 | ) |  |  | (483,113 | )
2022 |  |  | 2,592,611 |  |  |  | (1,956,274 | ) |  |  | 9,199,057 |  |  |  | 9,835,394 |
2021 |  |  | 2,212,215 |  |  |  | (1,743,625 | ) |  |  | 5,286,932 |  |  |  | 5,755,522 |
The amounts in the Inclusion of Equity Values for Non-PEO NEOs column in the table above are derived from the amounts set forth in the following table:
Fiscal Year |  | Average Fair Value of Unvested Current Year Awards at FYE for Non-PEO NEOs($) |  |  | Average Change in Value of Prior Year Awards Vesting During the Year for Non-PEO NEOs($) |  |  | Average Change in Value of Unvested Equity from Prior Years for Non-PEO NEOs($) |  |  | Average Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year for Non-PEO NEOs($) |  |  | Average Fair Value at Last Day of Prior Year of Equity Awards Forefeited during Year for Non-PEO NEOs($) |  |  | Average Total- Inclusion of Equity Values for Non-PEO NEOs($) |
2023 |  |  | 2,779,010 |  |  |  | (615,781 | ) |  |  | (3,238,882 | ) |  |  | 214,717 |  |  |  | — |  |  |  | (860,936 | )
2022 |  |  | 2,243,894 |  |  |  | 1,303,642 |  |  |  | 5,350,587 |  |  |  | 300,933 |  |  |  | — |  |  |  | 9,199,057 |
2021 |  |  | 3,131,381 |  |  |  | 26,321 |  |  |  | 1,867,424 |  |  |  | 261,806 |  |  |  | — |  |  |  | 5,286,932 |
(5) | Total shareholder return is calculated by assuming that a $100 investment was made on the last trading day prior to the earliest fiscal year reported in this table and reinvesting all dividends until the last day of each reported fiscal year.
(6) | The peer group used is the PHLX Semiconductor Sector Index (SOX), as used in the performance graph included in our annual report. Total shareholder return is calculated by assuming that a $100 investment was made on the last trading day prior to the earliest fiscal year reported in this table and reinvesting all dividends until the last day of each reported fiscal year.
(7) | The dollar amounts reported are the Company’s net income reflected in the Company’s audited financial statements.
(8) | The metric in this column, the Company’s revenue as reflected in the Company’s audited financial statements, in our assessment, represents the most important Company financial performance measure (that is not otherwise disclosed in this table) used to link compensation actually paid to company performance for the NEOs for all years presented. In particular, 1/3 of the annual bonus program for NEOs is based on the revenue metric. Other key financial performance measures linked to executive compensation are described under “Financial Performance Measures,” below. For additional information regarding actual performance, peer group, and executive compensation for the most recently completed fiscal year, see “Executive Compensation — Compensation Discussion and Analysis,” above.
Company Selected Measure Name | Revenue |  |
Named Executive Officers, Footnote [Text Block] | (i) for fiscal year 2023, Les Kohn, Brian White, Chan Lee, John Ju, and John Young; (ii) for fiscal year 2022, Les Kohn, Casey Eichler, Chan Lee, John Ju, and John Young; and (iii) for fiscal year 2021, Les Kohn, Casey Eichler, Michael Chen, and Christopher Day. |  |
Peer Group Issuers, Footnote [Text Block] | The peer group used is the PHLX Semiconductor Sector Index (SOX), as used in the performance graph included in our annual report. Total shareholder return is calculated by assuming that a $100 investment was made on the last trading day prior to the earliest fiscal year reported in this table and reinvesting all dividends until the last day of each reported fiscal year. |  |
PEO Total Compensation Amount | $ 5,904,850 | $ 6,205,867 | $ 5,596,549
PEO Actually Paid Compensation Amount | $ (5,223,250) | 21,197,673 | 14,765,032
Adjustment To PEO Compensation, Footnote [Text Block] | The following table presents a reconciliation of total compensation paid to the PEO for each year as reported in the Summary Compensation Table, above, to the compensation actually paid to the PEO, which was computed in accordance with Item 402(v) of Regulation S-K, as reported in the Pay versus Performance table, above.
Fiscal Year |  | Summary Compensation Table Total for PEO ($) |  |  | Exclusion of Stock Awards for PEO ($) |  |  | Inclusion of Equity Values for PEO ($) |  |  | Equals Compensation Actually Paid to PEO($) |
2023 |  |  | 5,904,850 |  |  |  | (5,343,850 | ) |  |  | (5,784,250 | ) |  |  | (5,223,250 | )
2022 |  |  | 6,205,867 |  |  |  | (4,905,867 | ) |  |  | 19,897,673 |  |  |  | 21,197,673 |
2021 |  |  | 5,596,549 |  |  |  | (4,717,849 | ) |  |  | 13,886,332 |  |  |  | 14,765,032 |
The amounts in the Inclusion of Equity Values for PEO column in the table above are derived from the amounts set forth in the following table:
Fiscal Year |  | Fair Value of Unvested Current Year Awards at FYE for PEO ($) |  |  | Change in Value of Prior Year Awards Vesting During the Year for PEO ($) |  |  | Change in Value of Unvested Equity from Prior Years for PEO ($) |  |  | Adjust for Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year for PEO ($) |  |  | Fair Value at Last Day of Prior Year of Equity Awards Forefeited during Year for PEO ($) |  |  | Total- Inclusion of Equity Values for PEO ($) |
2023 |  |  | 4,221,283 |  |  |  | (1,451,046 | ) |  |  | (9,054,092 | ) |  |  | 499,604 |  |  |  | — |  |  |  | (5,784,250 | )
2022 |  |  | 5,627,028 |  |  |  | 1,909,656 |  |  |  | 11,606,228 |  |  |  | 754,761 |  |  |  | — |  |  |  | 19,897,673 |
2021 |  |  | 8,472,740 |  |  |  | 41,072 |  |  |  | 4,664,085 |  |  |  | 708,435 |  |  |  | — |  |  |  | 13,886,332 |
Non-PEO NEO Average Total Compensation Amount | $ 3,702,220 | 2,592,611 | 2,212,215
Non-PEO NEO Average Compensation Actually Paid Amount | $ (483,113) | 9,835,394 | 5,755,522
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | The following table presents a reconciliation of average compensation paid to Non-PEO NEOs for each year as reported in the Summary Compensation Table above and in the Company’s previously filed proxy statements to the average compensation actually paid to the Non-PEO NEOs, which was computed in accordance with Item 402(v) of Regulation S-K, as reported in the Pay versus Performance table, above.
Fiscal Year |  | Average Summary Compensation Table Total for Non-PEO NEOs \($) |  |  | Average Exclusion of Stock Awards for Non-PEO NEOs($) |  |  | Average Inclusion of Equity Values for Non-PEO NEOs($) |  |  | Equals Average Compensation Actually Paid to Non-PEO NEOs ($) |
2023 |  |  | 3,702,220 |  |  |  | (3,324,397 | ) |  |  | (860,936 | ) |  |  | (483,113 | )
2022 |  |  | 2,592,611 |  |  |  | (1,956,274 | ) |  |  | 9,199,057 |  |  |  | 9,835,394 |
2021 |  |  | 2,212,215 |  |  |  | (1,743,625 | ) |  |  | 5,286,932 |  |  |  | 5,755,522 |
The amounts in the Inclusion of Equity Values for Non-PEO NEOs column in the table above are derived from the amounts set forth in the following table:
Fiscal Year |  | Average Fair Value of Unvested Current Year Awards at FYE for Non-PEO NEOs($) |  |  | Average Change in Value of Prior Year Awards Vesting During the Year for Non-PEO NEOs($) |  |  | Average Change in Value of Unvested Equity from Prior Years for Non-PEO NEOs($) |  |  | Average Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year for Non-PEO NEOs($) |  |  | Average Fair Value at Last Day of Prior Year of Equity Awards Forefeited during Year for Non-PEO NEOs($) |  |  | Average Total- Inclusion of Equity Values for Non-PEO NEOs($) |
2023 |  |  | 2,779,010 |  |  |  | (615,781 | ) |  |  | (3,238,882 | ) |  |  | 214,717 |  |  |  | — |  |  |  | (860,936 | )
2022 |  |  | 2,243,894 |  |  |  | 1,303,642 |  |  |  | 5,350,587 |  |  |  | 300,933 |  |  |  | — |  |  |  | 9,199,057 |
2021 |  |  | 3,131,381 |  |  |  | 26,321 |  |  |  | 1,867,424 |  |  |  | 261,806 |  |  |  | — |  |  |  | 5,286,932 |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Total Shareholder Return (“TSR”) The following chart sets forth the relationship between compensation actually paid (or CAP) to our PEO, the average of compensation actually paid to our No n -PEO NEOs, and the Company’s cumulative TSR as well as the PHLX Semiconductor Sector Index cumulative TSR for the fiscal years indicated. |  |
Compensation Actually Paid vs. Net Income [Text Block] | Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and N et Income (Loss) The following chart sets forth the relationship between compe nsation actually paid to our PEO, the average of compensation actually paid to our Non-PEO NEOs, and our net income (loss) during the three most recently completed fiscal years. |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Revenue The following chart sets forth the relationship between compensation actually paid to our PE O, the average of compensation actually paid to our Non-PEO NEOs, and our revenue during the three most recently completed fiscal years. |  |
Total Shareholder Return Vs Peer Group [Text Block] | Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Total Shareholder Return (“TSR”) The following chart sets forth the relationship between compensation actually paid (or CAP) to our PEO, the average of compensation actually paid to our No n -PEO NEOs, and the Company’s cumulative TSR as well as the PHLX Semiconductor Sector Index cumulative TSR for the fiscal years indicated. |  |
Tabular List [Table Text Block] | Financial Performance Measures As described in further detail in “Executive Compensation – Compensation Discussion and Analysis” above, our executive compensation program incorporates various Company financial performance metrics. Such metrics are used in both our long-term and short-term incentive awards and are selected with the objective of incentivizing our PEO and Non-PEO NEOs to increase the long-term value of our company for shareholders. The three most important financial performance measures used in fiscal year 2023 to link executive compensation actually paid to our PEO and Non-PEO NEOs, for the most recently completed fiscal year, to our financial performance are as follows (listed in no particular order of importance):
|  | Most Important Financial Performance Measures
|  | Revenue
|  | Non-GAAP operating profit
|  | Total Shareholder Return relative to the Russell 2000 Index
Total Shareholder Return Amount | $ 151.91 | 236.98 | 159.55
Peer Group Total Shareholder Return Amount | 180.82 | 209.94 | 170.15
Net Income (Loss) | $ (65,400,000) | $ (26,400,000) | $ (59,800,000)
Company Selected Measure Amount | 337,600,000 | 331,900,000 | 222,900,000
PEO Name | Dr. Feng-Ming (Fermi) Wang |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Revenue |  |
Non-GAAP Measure Description [Text Block] | The metric in this column, the Company’s revenue as reflected in the Company’s audited financial statements, in our assessment, represents the most important Company financial performance measure (that is not otherwise disclosed in this table) used to link compensation actually paid to company performance for the NEOs for all years presented. In particular, 1/3 of the annual bonus program for NEOs is based on the revenue metric. |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP operating profit |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Total Shareholder Return relative to the Russell 2000 Index |  |
PEO [Member] | Exclusion of Stock Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (5,343,850) | $ (4,905,867) | $ (4,717,849)
PEO [Member] | Inclusion of Equity Values [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (5,784,250) | 19,897,673 | 13,886,332
PEO [Member] | Fair Value of Unvested Current Year Awards at FYE [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 4,221,283 | 5,627,028 | 8,472,740
PEO [Member] | Change in Value of Prior Year Awards Vesting During the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,451,046) | 1,909,656 | 41,072
PEO [Member] | Change in Value of Unvested Equity from Prior Years [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (9,054,092) | 11,606,228 | 4,664,085
PEO [Member] | Adjust for Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 499,604 | 754,761 | 708,435
Non-PEO NEO [Member] | Exclusion of Stock Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (3,324,397) | (1,956,274) | (1,743,625)
Non-PEO NEO [Member] | Inclusion of Equity Values [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (860,936) | 9,199,057 | 5,286,932
Non-PEO NEO [Member] | Fair Value of Unvested Current Year Awards at FYE [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 2,779,010 | 2,243,894 | 3,131,381
Non-PEO NEO [Member] | Change in Value of Prior Year Awards Vesting During the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (615,781) | 1,303,642 | 26,321
Non-PEO NEO [Member] | Change in Value of Unvested Equity from Prior Years [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (3,238,882) | 5,350,587 | 1,867,424
Non-PEO NEO [Member] | Adjust for Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 214,717 | $ 300,933 | $ 261,806

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToNonPeoNeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToPeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_CoSelectedMeasureAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_CoSelectedMeasureName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph iii + Details
Name: | ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph ii + Details
Name: | ecd_CompActuallyPaidVsNetIncomeTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph i + Details
Name: | ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_MeasureName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_NamedExecutiveOfficersFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_NonGaapMeasureDescriptionTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_NonPeoNeoAvgCompActuallyPaidAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_NonPeoNeoAvgTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_PeerGroupIssuersFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_PeerGroupTotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_PeoActuallyPaidCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_PeoName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_PeoTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTable
Namespace Prefix: | ecd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 6 + Details
Name: | ecd_TabularListTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_TotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph iv + Details
Name: | ecd_TotalShareholderRtnVsPeerGroupTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 8: 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(20)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256 Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580 Reference 25: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794 Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794 Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 29: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 31: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 32: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 33: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 34: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 35: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ecd_MeasureAxis=1
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=2
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=3
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_ExecutiveCategoryAxis=ecd_PeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_ExclusionOfStockAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_InclusionOfEquityValuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_FairValueOfUnvestedCurrentYearAwardsAtFyeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_ChangeInValueOfPriorYearAwardsVestingDuringTheYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_ChangeInValueOfUnvestedEquityFromPriorYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=amba_AdjustForFairValueAsOfVestingDateOfEquityAwardsGrantedAndVestedInTheYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_ExecutiveCategoryAxis=ecd_NonPeoNeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |