XML 49 R40.htm IDEA: XBRL DOCUMENT
v3.20.4

Share-Based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Share-Based Compensation Expenses Related to Restricted Shares | The allocation of share-based compensation expense was as follows:
|  | Year Ended December 31, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Research and development expenses |  |  | 470 |  |  |  | 467 |  |  |  | 224,619 |  |  |  | 33,083 |
Administrative expenses |  |  | 514,733 |  |  |  | 514,726 |  |  |  | 167,957 |  |  |  | 24,737 |
|  |  | 515,203 |  |  |  | 515,193 |  |  |  | 392,576 |  |  |  | 57,820 |
Summary of Stock Options Activities | The following table sets forth the stock options activities of 2017 Plan for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average exercise price US$ |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value US$ |
Outstanding as of December 31, 2019 |  |  | 9,812,881 |  |  |  | 0.93 |  |  |  | 7.76 |  |  |  | 47,671 |
Exercised |  |  | (115,888 | ) |  |  | 1.00 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (336,377 | ) |  |  | 1.00 |  |  |  | — |  |  |  | — |
Surrendered (Note 15 (h)) |  |  | (332,566 | ) |  |  | 1.00 |  |  |  | — |  |  |  | — |
Outstanding as of September 30, 2020 |  |  | 9,028,050 |  |  |  | 0.93 |  |  |  | 7.01 |  |  |  | 175,576 |
Exercisable as of September 30, 2020 |  |  | 8,047,548 |  |  |  | 0.92 |  |  |  | 6.91 |  |  |  | 156,567 |
Summary of Valuation Assumptions Used | The Group determined the fair value of the put right with the assistance of an independent third-party valuation firm. The Group used the option pricing model (finnerty model) to estimate the fair value of the put right using the following assumptions:
|  | As of September 15, and September 30, |
|  | 2020 |
Expected terms (Year) |  |  | 4 |
Estimated volatility |  |  | 55.2 | %
Spot price |  | US$ | 143,401 |
Probability of triggering event for redemption option |  |  | 65 | %
2017 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of non-vested stock option activities for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average Grant date fair value US$ |
Non-vested at December 31, 2019 |  |  | 9,812,881 |  |  |  | 2.10 |
Vested |  |  | (8,047,548 | ) |  |  | 1.74 |
Exercised |  |  | (115,888 | ) |  |  | 2.14 |
Forfeited |  |  | (336,377 | ) |  |  | 2.26 |
Surrendered |  |  | (332,566 | ) |  |  | 1.47 |
Non-vested at September 30, 2020 |  |  | 980,502 |  |  |  | 5.02 |
2018 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Options Activities | The following table sets forth the stock options activities of 2018 Plan for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average exercise price US$ |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value US$ |
Outstanding as of December 31, 2019 |  |  | 13,536,588 |  |  |  | 1.00 |  |  |  | 9.15 |  |  |  | 64,840 |
Surrendered (Note 15 (h)) |  |  | (2,544,917 | ) |  |  | 1.00 |  |  |  | — |  |  |  | — |
Outstanding as of September 30, 2020 |  |  | 10,991,671 |  |  |  | 1.00 |  |  |  | 8.40 |  |  |  | 213.764 |
Exercisable as of September 30, 2020 |  |  | 10,166,671 |  |  |  | 1.00 |  |  |  | 8.40 |  |  |  | 197,720 |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of non-vested stock option activities for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average grant-date fair value US$ |
Non-vested at December 31, 2019 |  |  | 3,098,500 |  |  |  | 5.57 |
Vested |  |  | (2,273,500 | ) |  |  | 5.57 |
Non-vested at September 30, 2020 |  |  | 825,000 |  |  |  | 5.57 |
2019 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Options Activities | The following table sets forth the stock options activities of 2019 Plan for the nine months ended September 30, 2020 presented:
|  | Number of shares |  |  | Weighted average exercise price US$ |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value US$ |
Outstanding as of December 31, 2019 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | 72,000 |  |  |  | 6.09 |  |  |  | — |  |  |  | — |
Outstanding as of September 30, 2020 |  |  | 72,000 |  |  |  | 6.09 |  |  |  | 9.59 |  |  |  | 1,034 |
Exercisable as of September 30, 2020 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Summary of Valuation Assumptions Used | Stock options granted to the 3 independent directors were measured at fair value on the dates of grant using the Binomial Option Pricing Model with the following assumptions:
|  | Nine Months Ended September 30, |
|  | 2020 |
Expected volatility |  |  | 54.88 | %
Risk-free interest rate (per annum) |  |  | 0.79 | %
Exercise multiple |  |  | 2.80 |
Expected dividend yield |  |  | — |
Contractual term (in years) |  |  | 10 |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of non-vested stock options activity for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average grant-date fair value US$ |
Non-vested at December 31, 2019 |  |  | — |  |  |  | — |
Granted |  |  | 72,000 |  |  |  | 6.09 |
Non-vested at September 30, 2020 |  |  | 72,000 |  |  |  | 6.09 |
2020 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Options Activities | The following table sets forth the stock options activities of 2020 Plan for the nine months ended September 30, 2020:
Summary of Valuation Assumptions Used | Stock options granted to the employees were measured at fair value on the dates of grant using the Binomial Option Pricing Model with the following assumptions:
|  | Nine Months Ended September 30, |
|  | 2020 |
Expected volatility |  |  | 56.51 | %
Risk-free interest rate (per annum) |  |  | 0.86 | %
Exercise multiple |  |  | 2.20-2.80 |
Expected dividend yield |  |  | — |
Contractual term (in years) |  |  | 10 |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of non-vested stock option activities for the nine months ended September 30, 2020 is presented below:
|  | Number of shares |  |  | Weighted average grant-date fair value US$ |
Non-vested at December 31, 2019 |  |  | — |  |  |  | — |
Granted |  |  | 1,068,733 |  |  |  | 8.65 |
Forfeited |  |  | (18,693 | ) |  |  | 8.65 |
Non-vested at September 30, 2020 |  |  | 1,050,040 |  |  |  | 8.65 |
Restricted Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Share-Based Compensation Expenses Related to Restricted Shares | Share-based compensation expenses related to restricted shares are included in:
|  | Year Ended December 31, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Research and development expenses |  |  | 470 |  |  |  | 467 |  |  |  | — |  |  |  | — |
Administrative expenses |  |  | 1,096 |  |  |  | 1,089 |  |  |  | — |  |  |  | — |
|  |  | 1,566 |  |  |  | 1,556 |  |  |  | — |  |  |  | — |
Restricted Shares [Member] | 2018 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Options Activities | The following table sets forth the restricted share units subject to terms and conditions under 2018 Plan for the nine months ended September 30, 2020:
Schedule of Nonvested Restricted Stock Units Activity | A summary of non-vested restricted share units activities for the nine months ended September 30, 2020 is presented below:
|  | Number of restricted share units |  |  | Weighted average grant-date fair value US$ |
Non-vested at December 31, 2019 |  |  | — |  |  |  | — |
Granted |  |  | 1,328,120 |  |  |  | 13.34 |
Vested |  |  | (558,200 | ) |  |  | 13.98 |
Non-vested at September 30, 2020 |  |  | 769,920 |  |  |  | 12.88 |
Restricted Shares [Member] | 2020 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Stock Options Activities | The following table sets forth the restricted share units of 2020 Plan for the nine months ended September 30, 2020:
|  | Number of restricted share units |  |  | Weighted average exercise price US$ |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value US$ |
Outstanding as of December 31, 2019 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | 3,564,798 |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (13,461 | ) |  |  | — |  |  |  | — |  |  |  | — |
Outstanding as of September 30, 2020 |  |  | 3,551,337 |  |  |  | — |  |  |  | 9.91 |  |  |  | 72,617 |
Schedule of Nonvested Restricted Stock Units Activity | A summary of non-vested restricted share units activities for the nine months ended September 30, 2020 is presented below:
|  | Number of restricted share units |  |  | Weighted average grant-date fair value US$ |
Non-vested at December 31, 2019 |  |  | — |  |  |  | — |
Granted |  |  | 3,564,798 |  |  |  | 13.63 |
Forfeited |  |  | (13,461 | ) |  |  | 11.75 |
Non-vested at September 30, 2020 |  |  | 3,551,337 |  |  |  | 13.68 |

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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