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Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award Valuation Assumptions
The following weighted average assumptions were used to estimate the fair value of the options granted during the nine months ended September 30, 2022 and September 30, 2021:
20222021
Annualized volatility70 %66 %
Risk-free interest rate2.01 %0.38 %
Expected life of options in years5.0 years4.0 years
Estimated forfeiture rate12.1 %8.9 %
Dividend rate0.0 %0.0%
Fair value per common share option$6.60 $6.64 
Schedule of Option Activity
The following table summarizes the option award activity for the nine months ended September 30, 2022:

September 30, 2022
Number of shares (in thousands)Weighted average exercise price $
Outstanding - December 31, 202112,074 $12.84 
Granted3,809 11.25 
Exercised(77)6.47 
Forfeited(1,507)14.63 
Outstanding - September 30, 202214,299 $12.26 
Schedule of Performance Shares Activity
The following table summarizes the PA and RSU activity for the nine months ended September 30, 2022:
September 30, 2022
Number of shares (in thousands)Weighted average exercise price $
Outstanding - December 31, 2021347 $13.33 
Granted2,311 11.26 
Vested(305)14.17 
Forfeited(255)12.39 
Outstanding - September 30, 20222,098 $11.04 
Allocation of Share-Based Payments
The Company recognized share-based compensation expense for the three and nine month periods ended September 30, 2022 and September 30, 2021 as follows:
Three months ended
September 30,
Nine Months Ended
September 30,
(in thousands)2022202120222021
Research and development$1,489 $1,038 $3,531 $3,201 
Selling, general and administrative6,625 6,000 21,480 19,189 
Capitalized under inventories206 54 387 276 
Share-based compensation expense$8,320 $7,092 $25,398 $22,666