Quarterly report pursuant to Section 13 or 15(d)

7. SHARE-BASED COMPENSATION (Tables)

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7. SHARE-BASED COMPENSATION (Tables)
9 Months Ended
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     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:

              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:

            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