XML 34 R22.htm IDEA: XBRL DOCUMENT
v3.21.2

Share-based compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Share-based compensation |
Schedule of Stock-based compensation expense | Share-based compensation expense recorded as research and development and general and administrative expenses in the condensed statements of operations is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | ​ | $ | 368 | ​ | $ | 8 | ​ | $ | 522 | ​ | $ | 55
General and administrative | ​ |  | 381 | ​ |  | 31 | ​ |  | 552 | ​ |  | 130
​ | ​ | $ | 749 | ​ | $ | 39 | ​ | $ | 1,074 | ​ | $ | 185
Weighted average assumptions used in option-pricing | The weighted average assumptions used in the Black-Scholes option-pricing model for stock options granted were:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, |  | ​
​ |  | 2021 |  | 2020 |  |
Expected volatility |  | ​ | 83.1 | % | ​ | 80.0 | % |
Risk-free interest rate |  | ​ | 1.1 | % | ​ | 0.8 | % |
Expected term (in years) |  | ​ | 6.04 |  | ​ | 5.64 | ​ |
Expected dividend yield |  | ​ | — |  | ​ | — | ​ |
Fair value of common stock | ​ | $ | 25.60 | ​ | $ | 1.62 | ​ | ​
Summary of option activity | A summary of option activity during the six months ended June 30, 2021 is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | average
​ | ​ | ​ | ​ | average | ​ | remaining
​ | ​ | Number of | ​ | exercise price | ​ | contractual
​ | ​ | shares | ​ | per share | ​ | term (years)
Outstanding at January 1, 2021 |  | 1,472,840 | ​ | $ | 3.14 |  | 8.51
Granted |  | 581,231 | ​ | $ | 25.60 |  |
Forfeited |  | (5,505) | ​ | $ | 8.10 |  |
Exercised |  | (32,530) | ​ | $ | 0.82 |  |
Outstanding at June 30, 2021 |  | 2,016,036 | ​ | $ | 9.64 |  | 8.54
Exercisable at June 30, 2021 |  | 705,784 | ​ | $ | 1.13 |  | 7.14
Vested or expected to vest at June 30, 2021 |  | 2,016,036 | ​ | $ | 9.64 |  | 8.54

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