XML 58 R28.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

EQUITY INCENTIVE PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Stock Units and Performance-based Restricted Stock Units Activity | The following table summarizes RSU and PRSU activity during the year ended December 31, 2023:
| Number of RSUs and PRSUs |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2022 | 1,223,871 |  |  | $ | 1.47 |
RSUs and PRSUs granted | 1,515,817 |  |  | 1.00 |
RSUs and PRSUs vested | (490,520) |  |  | 1.48 |
RSUs and PRSUs canceled | (151,115) |  |  | 1.29 |
Outstanding at December 31, 2023 | 2,098,053 |  |  | $ | 1.14 |
Schedule of Stock Option Activity | The following table summarizes stock option activity during the year ended December 31, 2023:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Total Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022 | 8,099,624 |  |  | $ | 2.78 |  |  | 6.65 |  | $ | 48 |
Options granted | 3,233,558 |  |  | 1.02 |  |  |  |  |
Options exercised | (25,750) |  |  | 0.83 |  |  |  |  |
Options canceled | (641,417) |  |  | 3.12 |  |  |  |  |
Outstanding at December 31, 2023 | 10,666,015 |  |  | $ | 2.23 |  |  | 6.72 |  | $ | 57 |
Vested and expected to vest at December 31, 2023 | 10,666,015 |  |  | $ | 2.23 |  |  | 6.72 |  | $ | 57 |
Exercisable at December 31, 2023 | 7,236,987 |  |  | $ | 2.75 |  |  | 5.71 |  | $ | 54 |
Schedule of Black-Scholes Option Pricing Model Assumptions | The following table summarizes the Black-Scholes option pricing model assumptions used to estimate the fair value of stock options granted to employees under the 2015 EIP and 2020 IIP and the shares purchasable under the 2015 ESPP during the periods presented:
| For the years ended December 31,
| 2023 |  | 2022
2015 EIP and 2020 IIP |  |  |
Risk-free interest rate | 3.58% - 4.61% |  | 1.39% - 4.02%
Expected dividend yield | 0% |  | 0%
Expected volatility | 82% - 83% |  | 70% - 75%
Expected term (years) | 5.50 - 6.08 |  | 5.50 - 6.08
2015 ESPP |  |  |
Risk-free interest rate | 4.29% - 5.43% |  | 1.57% - 2.65%
Expected dividend yield | 0% |  | 0%
Expected volatility | 64% - 147% |  | 75% - 98%
Expected term (years) | 0.50 - 2.00 |  | 0.50 - 2.00
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense recognized for RSUs, PRSUs, stock options, and the ESPP has been reported in the consolidated statements of operations and comprehensive loss as follows (in thousands):
| Years ended December 31,
| 2023 |  | 2022 |  |
Research and development | $ | 1,592 |  |  | $ | 1,760 |  |  |
Selling, general and administrative | 1,469 |  |  | 1,945 |  |  |
Total | $ | 3,061 |  |  | $ | 3,705 |  |  |

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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration