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Share-based Compensation
 6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation Share-based Compensation
During the six months ended June 30, 2023 and 2022 , the Company granted awards under the 2018 Omnibus Incentive Compensation Plan, previously named the Amended and Restated 2009 Omnibus Incentive Compensation Plan (the “2018 Plan”), and the 2015 Incentive Compensation Plan (the “2015 Plan”). The Compensation Committee of the Board of Directors administers the plans. Under the 2018 Plan, a maximum of 7,474,326 shares of common stock may be issued upon the exercise of stock options, in the form of restricted stock, or in settlement of restricted stock units (“RSUs”) or other awards, including awards with alternative vesting schedules such as performance-based criteria.
The following table presents total share-based compensation expense within each functional line item on the condensed consolidated statements of operations for the three and six months ended June 30, 2023 and 2022 (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
  
2023 1
2022
2023 1
2022
Cost of revenues$223 $259 406 $1,674 
Research and development445 428 693 4,498 
Sales and marketing390 554 719 2,597 
General and administrative907 1,046 1,945 4,717 
      Total$1,964 $2,287 $3,762 $13,486 
1Rounding may impact summation of amounts.
Stock Options
The Compensation Committee of the Board of Directors determines eligibility, vesting schedules and exercise prices for stock options granted. The Company generally uses the Black-Scholes option pricing model to estimate the fair value of its stock options. For performance stock awards subject to market-based vesting conditions, fair values are determined using the Monte-Carlo simulation model. Stock options generally have a term of ten years and vest over a three- to four-year period.
The following table summarizes the Company’s stock option activity for the six months ended June 30, 2023:
Outstanding — December 31, 20228,132,959 
Granted128,250 
Canceled(886,833)
Outstanding — June 30, 20237,374,376 
Exercisable — June 30, 20235,518,502 
At June 30, 2023, total unrecognized compensation expense related to stock options was $5.5 million, which is expected to be recognized over a weighted-average period of 2.42 years.
Restricted Stock Units
Pursuant to the 2018 Plan and the 2015 Plan, the Company may issue RSUs that, upon satisfaction of vesting conditions, allow recipients to receive common stock. Issuances of such awards reduce common stock available under the 2018 Plan and 2015 Plan for stock incentive awards. The Company measures compensation cost associated with grants of RSUs at fair value, which is generally the closing price of the Company’s stock on the date of grant. RSUs generally vest over a three- to four-year period.
On April 28, 2023, the Company granted a total of approximately 2.2 million RSUs to certain employees to encourage retention and incentivize future performance (“Retention Awards”). All of the Retention Awards fully vest on November 1, 2023.
The following table summarizes the Company’s RSU activity (including above retention RSUs) for the six months ended June 30, 2023:
Non-vested — December 31, 20221,178,370 
Granted2,235,890 
Vested(105,015)
Forfeited(120,109)
Non-vested — June 30, 20233,189,136 
At June 30, 2023, total unrecognized compensation expense related to RSUs was $3.6 million, which is expected to be recognized over a weighted-average period of 0.82 years.