Quarterly report pursuant to Section 13 or 15(d)

7. SHARE-BASED COMPENSATION (Tables)

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7. SHARE-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2022
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     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
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 June 30, 2022:

              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
Restricted Stock Unit Activity

The following table summarizes activity and positions with respect to RSUs and PSUs for the six months ended June 30, 2022:

            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