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Share-Based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Assumptions Used to Calculate Fair Value of Each Stock Option Award Estimated on the Date of Grant Using the Black-Scholes Valuation Model The assumptions noted below represent the weighted average of assumptions utilized for stock options granted during 2021, 2020 and 2019 under the LTIP.
Year ended December 31,
 202120202019
Dividend yield— — — 
Expected volatility64.4 %50.4 %41.8 %
Risk-free interest rate0.8 %1.5 %2.6 %
Expected life of stock options granted during the period6.0 years6.0 years6.0 years
Schedule of Stock Option Awards Granted in 2017 Represent the New Awards Granted Under the LTIP The table below presents the changes in stock option awards for our ordinary shares from December 31, 2020 through December 31, 2021.
SharesWeighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
 (in thousands) (in years)(in millions)
Outstanding at December 31, 20203,415 $7.16 
Granted1,014 4.13 
Exercised(11)3.10 
Forfeited(50)4.07 
Expired(38)11.97 
Outstanding at December 31, 20214,330 6.45 7.7$— 
Exercisable at December 31, 20211,965 9.56 6.8— 
Schedule of Changes in Nonvested Awards for our Ordinary Shares
The table below presents the changes in nonvested awards for our ordinary shares from December 31, 2020 through December 31, 2021.
 SharesWeighted
Average
Grant-Date
Fair Value
 (in thousands) 
Nonvested at December 31, 20202,718 $4.94 
Granted1,480 4.77 
Vested(1)
(896)5.49 
Forfeited(24)3.99 
Nonvested at December 31, 20213,278 4.72 
(1)As of December 31, 2021, a total of 269,141 restricted stock units were vested but not yet issued. These shares have not been reflected as vested shares in the table because, in accordance with the restricted stock unit agreements, these shares are not issued for vested restricted stock until termination of employment.