XML 52 R25.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following summarizes stock option activity:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  |  |  |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  |  | Value |
|  |  |  |  |  |  |  |  |  | (In years) |  |  | (In thousands) |
Outstanding—December 31, 2019 |  |  | 2,117,106 |  |  | $ | 2.52 |  |  |  | 8.7 |  |  | $ | 2,825 |
Granted |  |  | 1,098,542 |  |  | $ | 16.88 |  |  |  |  |  |  |  |  |
Exercised |  |  | (53,134 | ) |  | $ | 1.47 |  |  |  |  |  |  |  |  |
Forfeited and Canceled |  |  | (406,412 | ) |  | $ | 2.38 |  |  |  |  |  |  |  |  |
Outstanding—December 31, 2020 |  |  | 2,756,102 |  |  | $ | 8.28 |  |  |  | 8.6 |  |  | $ | 57,090 |
Options Exercisable—December 31, 2020 |  |  | 1,925,666 |  |  | $ | 3.00 |  |  |  | 8.1 |  |  | $ | 50,109 |
Schedule of Assumptions Using Black-Scholes to Estimate Fair Value of Each Awards | The fair value of each award is estimated using Black-Scholes based on the following assumptions:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Expected term (years) |  | 5.0-6.1 |  |  | 5.1-6.1 |
Expected volatility |  | 85% |  |  | 80% |
Risk-free interest rate |  | 0.25%-0.53% |  |  | 1.8%-2.5% |
Expected dividend |  |  | — |  |  |  | — |
Summary of Stock-Based Compensation Expense | Stock-based compensation expense is classified as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Research and development |  | $ | 390 |  |  | $ | 215 |
General and administrative |  |  | 1,398 |  |  |  | 523 |
Total stock-based compensation expense |  | $ | 1,788 |  |  | $ | 738 |

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=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 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 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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
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