XML 92 R30.htm IDEA: XBRL DOCUMENT
v3.22.0.1

STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense | The following table shows total stock-based compensation expense recognized in the accompanying Consolidated Statements of Operations (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Research and development | $ | 19,534 |  |  | $ | 13,523 |  |  | $ | 10,135 |
General and administrative | 13,422 |  |  | 12,185 |  |  | 9,195 |
Total stock-based compensation expense | $ | 32,956 |  |  | $ | 25,708 |  |  | $ | 19,330 |
Assumptions Used for Estimating Fair Value of Employee Stock Options | The assumptions used for estimating the fair value of the employee stock options were as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Risk-free interest rate | 0.95-1.22% |  | 0.34-0.61% |  | 1.68-2.25%
Expected term (in years) | 5.46-5.52 |  | 5.51-5.57 |  | 5.50-5.62
Expected dividend yield of stock | — |  |  | — |  |  | — |
Expected volatility | 77.30-79.77% |  | 77.61-80.32% |  | 76.46-78.39%
Weighted-Average Assumptions Used for Estimating Fair Value of ESPP Purchase Rights | The assumptions used for estimating the fair value of the ESPP purchase rights are as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Risk-free interest rate | 0.01-2.80% |  | 1.53-2.80% |  | 1.53-2.42%
Expected term (in years) | 0.01-2.0 |  | 0.5-2.0 |  | 0.5-2.0
Expected dividend yield of stock | — |  |  | — |  |  | — |
Expected volatility | 32.54-97.88% |  | 51.02-91.96% |  | 51.02-91.96%

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 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=122041274&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: | 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 employee stock purchase plans, including, but not limited to: (a) expected term, (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_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration