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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS (Tables)
 3 Months Ended
Mar. 31, 2026
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Unit Activity
The table below summarizes RSU activity for the three months ended March 31, 2026:
RSUs
Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2025555,564 $17.36 
Granted4,264 12.40 
Vested(31,279)26.43 
Forfeited(5,865)11.66 
Unvested at March 31, 2026522,684 $16.84 
Schedule of Weighted-Average Assumptions for Stock Options The weighted-average assumptions for stock options granted are outlined in the following table:
Dividend yield0.0 %
Risk-free interest rate4.1 %
Expected term (in years)2.00
Expected volatility78.2 %
Schedule of Stock Options Activity
The table below summarizes stock option activity for the three months ended March 31, 2026:
OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (in years)
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 20253,062,500 $6.00 0.25$35,556 
Outstanding at March 31, 20263,062,500 6.00 0.0018,069 
Exercisable at March 31, 20263,062,500 $6.00 0.00$18,069 
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
The following table summarizes the outstanding PSU award stock price hurdles and service conditions of the 2024 Executive PSU and 2025 PSU programs:

2024 Executive PSUs
2025 PSUs
Stock price hurdles
$14.86; $20.14; $31.01; $68.82
$19.75; $26.76; $31.01; $68.82
Service conditions
Incremental 33% of award met after May 1, 2025, May 1, 2026, and May 1, 2027
Incremental 33% of award met after May 1, 2026, May 1, 2027, and May 1, 2028
Schedule of Share-Based Payment Arrangement, Outstanding PSU Award Activity
The following table summarizes the outstanding PSU award activity for the three months ended March 31, 2026:
2024 Executive PSUs
2025 PSUs (1)
UnitsWtd. Avg. Grant Date FVUnitsWtd. Avg. Grant Date FV
Unvested at December 31, 2025
2,590,355 14.00 1,730,068 24.14 
Granted
— — 457,354 9.91 
Vested
— — (23,721)30.75 
Forfeited
— — — — 
Unvested at March 31, 2026
2,590,355 14.00 2,163,701 21.06 

(1)     Relates to vesting upon certification by the Compensation Committee that certain service and performance conditions were satisfied during the three months ended March 31, 2026 under specified terms provided for under the grant agreements for our CEO, Dusan Senkypl, and COO, Jiri Ponrt.
Schedule of Share-Based Payment Award, Equity Instrument Other than Options, Valuation Assumptions
The key inputs used in the Monte Carlo simulation and requisite service period for the 2024 Executive PSUs and 2025 PSUs are as follows:

2024 Executive PSUs
2025 PSUs
Grant Date
June 12, 2024October 14, 2024
May 20, 2025 (1)
January 29, 2026
Dividend Yield
0.00 %0.00 %0.00 %0.00 %
Risk-free interest rate
4.46 %3.86 %3.91 %3.52 %
Expected volatility
95.73 %98.70 %98.88 %85.81 %
Requisite service period (in years)
2.882.542.952.25
(1)     Only one award of 2025 PSUs was granted in June 2025, three awards of 2025 PSUs were granted in July 2025, and four awards of 2025 PSUs were granted in October 2025. Key inputs used in the Monte Carlo simulation and requisite service period are materially the same as the awards granted in May 2025.