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7. SHARE-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
7. SHARE-BASED COMPENSATION | 7. SHARE-BASED COMPENSATION Share-Based Compensation We issue share-based compensation to employees in the form of stock options, restricted stock units (RSUs), and performance stock units (PSUs). We account for the share-based awards by recognizing the fair value of share-based compensation expense on a straight-line basis over the service period of the award, net of estimated forfeitures. The fair value of stock options is estimated on the grant date using the Black-Scholes option pricing model. The fair value of RSUs and non-executive PSUs is based on the closing price of our common stock on the grant date. Executive PSUs are valued using a Monte Carlo simulation model using the following inputs: stock price, volatility, and risk-free interest rates. Changes in estimated inputs or using other option valuation methods may result in materially different option values and share-based compensation expense. 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 |  |  | Six Months Ended
|  |  | June 30, |  |  | June 30,
(in thousands) |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021
Research and development expense |  | $ | 2,018 |  | $ | 2,201 |  | $ | 3,851 |  | $ | 3,387
Sales, marketing, general and administrative expense |  |  | 2,102 |  |  | 5,696 |  |  | 4,003 |  |  | 6,148
|  | $ | 4,120 |  | $ | 7,897 |  | $ | 7,854 |  | $ | 9,535
Options activity and 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 June 30, 2022: Option Positions
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  | Weighted- |  | Average |  |  |
|  |  |  |  | Average |  | Remaining |  |  | Aggregate
Options |  |  |  |  | Exercise |  | Contractual |  |  | Intrinsic
|  | Shares |  |  | Price |  | Term (years) |  |  | Value
Outstanding as of June 30, 2022 |  | 1,153,000 |  | $ | 1.30 |  | 5.7 |  | $ | 3,003,000
Exercisable as of June 30, 2022 |  | 982,000 |  | $ | 1.42 |  | 5.5 |  | $ | 2,451,000
As of June 30, 2022, our unrecognized share-based employee compensation related to stock options was $6,000 which we plan to expense over the next 0.3 years. Restricted stock activity and positions The following table summarizes activity and positions with respect to RSUs and PSUs for the six months ended June 30, 2022: Restricted Stock Unit Activity
|  |  |  |  |  | Weighted-average
|  |  | Shares |  |  | price
Unvested as of December 31, 2021 |  |  | 2,625,000 |  | $ | 13.05
Granted |  |  | 8,367,000 |  |  | 2.24
Vested |  |  | (794,000) |  |  | 11.83
Forfeited |  |  | (410,000) |  |  | 12.80
Unvested as of June 30, 2022 |  |  | 9,788,000 |  | $ | 3.92
In June 2022, we issued 6.0 million PSUs to our executive officers. The PSUs are subject to the achievement of performance goals and time-based vesting. The PSUs will become eligible to vest if the closing price of our common stock reaches or exceeds specified price thresholds for at least 20 consecutive trading days during the performance period through December 31, 2025. If the performance goals are met, the portion of the PSUs deemed earned will become subject to time-based vesting in equal quarterly installments over two years starting from the date on which the goal is achieved. These PSUs were valued using a Monte Carlo simulation model using the following inputs: stock price, volatility, and risk-free interest rates. During the six months ended June 30, 2022, we issued 1.6 million PSUs to non-executive employees subject to the achievement of development goals. These shares were valued based on the closing price of our common stock on the dates of grant. These shares vest quarterly over two years from the achievement of established performance criteria. During the six months ended June 30, 2022, we issued 508,000 time-based RSUs to non-executive employees for promotion, retention, and new hire grants. These shares were valued based on the closing price of our common stock on the dates of grant. These shares vest over three or four years from the date of grant. As of June 30, 2022, our unrecognized share-based compensation related to RSUs was $18.4 million which we plan to expense over the next 2.0 years. Our unrecognized share-based compensation related to the executive PSUs was $9.1 million, which we plan to expense over the next 3.2 years and our unrecognized share-based compensation related to the non-executive PSUs was $4.9 million, which we plan to expense over the next 1.2 years.

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