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Share-based compensation (Tables)
12 Months Ended
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Summary of Stock Option Activity
Activity for the year ended December 31, 2023, under the 2013 ISOP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 2023657,980 $2.92 4.24
Exercised(39,000)2.52 — 
Forfeited(12,000)0.05 — 
Outstanding as of December 31, 2023606,980 $3.00 3.49
Exercisable as of December 31, 2023606,980 $3.00 3.49

Activity for the year ended December 31, 2022, under the 2013 ISOP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 2022859,540 $2.75 5.08
Exercised(193,560)2.44 — 
Forfeited(8,000)3.19 — 
Outstanding as of December 31, 2022657,980 $2.92 4.24
Exercisable as of December 31, 2022657,980 $2.92 4.24
Activity for the year ended December 31, 2023, under the 2019 ISOP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 20232,629,516 4.96 7.21
Exercised(32,000)4.06 — 
Forfeited(195,006)4.94 — 
Outstanding as of December 31, 20232,402,510 $4.97 6.30
Exercisable as of December 31, 20231,651,493 $4.64 6.03

Activity for the year ended December 31, 2022, under the 2019 ISOP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 20222,812,500 $5.83 8.61
Exercised(47,000)7.25 — 
Forfeited(135,984)5.15 — 
Outstanding as of December 31, 20222,629,516 $4.96 7.21
Exercisable as of December 31, 20221,476,744 $4.41 6.56
Activity for the year ended December 31, 2023, under the 2021 EIP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 20232,624,297 $12.32 8.88
Granted3,734,266 4.44 — 
Exercised(5,194)2.63 — 
Forfeited(645,310)$6.43 — 
Outstanding as of December 31, 20235,708,059 $7.84 8.74
Exercisable as of December 31, 20231,155,231 $14.64 7.57

Activity for the year ended December 31, 2022, under the 2021 EIP was as follows:
Number of optionsWeighted average exercise priceWeighted average remaining life in years
Outstanding as of January 1, 20221,576,069 $17.96 9.57
Granted1,336,284 6.03 — 
Forfeited(288,056)14.00 — 
Outstanding as of December 31, 20222,624,297 $12.32 8.88
Exercisable as of December 31, 2022528,693 $17.98 8.04
Summary of Valuation Inputs
The valuation inputs for the 2019 ISOP grants were as follows:
Twelve months ended December 31,
202320222021
Share price at grant date (in USD)N/AN/A$5.59
Expected life of share options (years)N/AN/A6.05-6.19
Expected volatilityN/AN/A41.26 %-41.45%
Risk free interest rateN/AN/A(0.63)%-(0.48)%
Dividend yield (%)N/AN/A—%
The valuation inputs for the 2021 EIP grants were as follows:
Year Ended December 31, 
202320222021
Share price at grant date (in USD)$2.53-$4.72$2.06-$8.36$16.81-$18.00
Expected life of share options (years) 5.50 - 7.00 5.50-7.005.50-7.00
Expected volatility (%)69.50 %-74.96%62.65 %-69.43%41.65 %-59.77%
Risk free interest rate (%)3.45 %-4.67%2.42 %-4.00%0.87 %-1.36%
Dividend yield (%)—%—%—%
Summary of Weighted Average Fair Value of Options Granted
The weighted average fair value of options granted during the years ended December 31, 2023 and 2022, respectively (in USD):
20232022
2021 EIP$2.91 $3.62 
Summary of Restricted Stock Units Activity The activity for the year ended December 31, 2023 was as follows:
Number of RSUsWeighted-average grant date fair value per share
Unvested as of January 1, 20231,865,433 $5.20 
Granted2,658,150 $4.42 
Vested(927,155)$4.65 
Forfeited(261,160)$4.75 
Unvested as of December 31, 20233,335,268 $4.77 
The activity for the year ended December 31, 2022 was as follows:
Number of RSUsWeighted-average grant date fair value per share
Unvested as of January 1, 2022287,575 $17.97 
Granted1,776,832 4.30 
Vested(133,056)17.99 
Forfeited(65,918)10.72 
Unvested as of December 31, 20221,865,433 $5.20 
Summary of Movements in Share-based Compensation Reserve
Movements in the share-based compensation reserve were as follows (in USD thousands):
Total
January 1, 2022$11,462 
Movement in the period13,613 
December 31, 202225,075 
Movement in the period15,242 
December 31, 2023$40,317 
Share-based compensation expense by financial statement caption for all stock awards consists of the following (in USD thousands):
Year ended December 31,
202320222021
Research and development$3,440 $2,245 784
Sales and marketing1,266 1,462 1,227 
General and administrative10,536 9,906 6,503 
Total$15,242 $13,613 $8,514