XML 40 R22.htm IDEA: XBRL DOCUMENT
v3.22.4

Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2022:
|  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Weighted |  |  | Average |  |  |  |
|  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  |  | Value |
|  |  |  |  |  |  |  | (In years) |  |  | (In thousands) |
Balance outstanding as of December 31, 2021 |  |  | 2,406,668 |  |  | $ | 16.46 |  |  |  | 8.1 |  |  | $ | 9,970 |
Granted |  |  | 1,149,816 |  |  |  | 4.48 |  |  |  |  |  |  |
Exercised |  |  | (151,061 | ) |  |  | 2.09 |  |  |  |  |  |  |
Cancelled and forfeited |  |  | (243,506 | ) |  |  | 16.34 |  |  |  |  |  |  |
Balance outstanding as of December 31, 2022 |  |  | 3,161,917 |  |  | $ | 12.80 |  |  |  | 7.9 |  |  | $ | 16,612 |
Exercisable as of December 31, 2022 |  |  | 1,460,685 |  |  | $ | 14.60 |  |  |  | 7.0 |  |  | $ | 7,320 |
Summary of Estimated Fair Value of Stock Options Granted Using Black-Scholes Option-Pricing Model | The fair value of stock options granted for the periods presented was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:
|  | Year Ended December 31,
|  | 2022 |  | 2021
Expected term (years) |  | 5.5-6.3 |  | 5.5-6.1
Expected volatility |  | 89.9-91.0% |  | 86.9-91.9%
Risk-free interest rate |  | 1.6-3.9% |  | 0.7-1.3%
Expected dividend |  | — |  | —
Summary of Restricted Stock Unit Activity | The following table summarizes RSU activity for the year ended December 31, 2022:
|  | Number of RSUs |  |  | Weighted Average Fair Value at Date of Grant per Unit |
Balance outstanding as of December 31, 2021 |  |  | 106,394 |  |  | $ | 23.10 |
Granted |  |  | 1,224,391 |  |  |  | 4.61 |
Vested / released |  |  | (103,703 | ) |  |  | 8.61 |
Cancelled / forfeited |  |  | (131,344 | ) |  |  | 5.53 |
Balance outstanding as of December 31, 2022 |  |  | 1,095,738 |  |  |  | 5.77 |
Summary of Stock-Based Compensation | The Company recorded stock-based compensation for the periods indicated as follows (in thousands):
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |
Research and development |  | $ | 4,094 |  |  | $ | 2,966 |
General and administrative |  |  | 6,262 |  |  |  | 5,712 |
Total stock-based compensation |  | $ | 10,356 |  |  | $ | 8,678 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration