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Share-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation
 Three Months Ended
June 30,		Six Months Ended
June 30,
  2022202120222021
Cost of revenues$259 $234 $1,674 $1,812 
Research and development428 534 4,498 3,762 
Sales and marketing554 559 2,597 2,547 
General and administrative1,046 980 4,717 3,284 
      Total$2,287 $2,307 $13,486 $11,405 
During the quarter ended March 31, 2022, the Board of Directors of the Company approved and the Company granted restricted stock units to eligible employees under the 2018 Plan that were immediately vested, as fiscal 2021 annual bonus payments. The total charges recorded during the quarter ended March 31, 2022 were $8.8 million. Such bonus payments in fiscal 2021 were paid and recorded in the quarter ended March 31, 2021 and total charges related to such bonus payments were $7.0 million.
Summary of Stock Option Activity The following table summarizes the Company’s stock option activity for the six months ended June 30, 2022:
Outstanding — December 31, 20218,085,793 
Granted1,422,500 
Exercised(212,791)
Canceled(657,005)
Outstanding — June 30, 20228,638,497 
Exercisable — June 30, 20225,229,193 
Summary of Restricted Stock Unit Activity The following table summarizes the Company’s RSU activity for the six months ended June 30, 2022:
Non-vested — December 31, 20211,247,723 
Granted2,203,100 
Vested(1,911,264)
Forfeited(130,633)
Non-vested — June 30, 20221,408,926