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7. SHARE-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Share-based Compensation Expense by Line Item | The following table summarizes the amount of share-based compensation expense by line item on the statements of operations: Share-based Compensation Expense by Line Item
Share-based compensation expense |  |  | Three Months Ended |  |  | Nine Months Ended
|  |  | September 30, |  |  | September 30,
(in thousands) |  |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020
Research and development expense |  | $ | 1,371 |  | $ | 291 |  | $ | 4,758 |  | $ | 433
Sales, marketing, general and administrative expense |  |  | 1,439 |  |  | 159 |  |  | 7,587 |  |  | 406
|  | $ | 2,810 |  | $ | 450 |  | $ | 12,345 |  | $ | 839
Option Positions | The following table summarizes shares, weighted-average exercise price, weighted-average remaining contractual term and aggregate intrinsic value of options outstanding and options exercisable as of September 30, 2021: Option Positions
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  | Weighted- |  | Average |  |  |
|  |  |  |  | Average |  | Remaining |  |  | Aggregate
Options |  |  |  |  | Exercise |  | Contractual |  |  | Intrinsic
|  | Shares |  |  | Price |  | Term (years) |  |  | Value
Outstanding as of September 30, 2021 |  | 1,712,000 |  | $ | 1.31 |  | 6.5 |  | $ | 16,689,000
Exercisable as of September 30, 2021 |  | 1,351,000 |  | $ | 1.49 |  | 6.1 |  | $ | 12,942,000
Restricted Stock Unit Activity | The following table summarizes activity and positions with respect to RSUs and PSUs for the nine months ended September 30, 2021: Restricted Stock Unit Activity
|  |  |  |  |  | Weighted-average
|  |  | Shares |  |  | price
Unvested as of December 31, 2020 |  |  | 1,983,000 |  | $ | 0.76
Granted |  |  | 3,937,000 |  |  | 13.21
Vested |  |  | (2,250,000) |  |  | 2.99
Forfeited |  |  | (1,117,000) |  |  | 12.16
Unvested as of September 30, 2021 |  |  | 2,553,000 |  | $ | 13.01

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- 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
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- 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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