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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock awards and performance stock awards activity issued under the 2017 Plan and the 2020 Plan for the year ended December 31, 2020:
Restricted Stock AwardsPerformance Stock Awards
 Number of
Shares		Weighted
Average
Grant Date
Fair Value		Number of Target
Shares		Weighted
Average
Grant Date
Fair Value
Unvested restricted stock awards, January 1, 2020996,794 $8.54 364,557 $9.66 
Granted829,023 $6.65 286,415 $6.74 
Vested(404,478)$8.81 — $— 
Forfeited(75,520)$7.71 (102,821)$12.32 
Unvested restricted stock awards, December 31, 20201,345,819 $7.04 548,151 $7.64 
Stock Options and Stock Appreciation Rights Granted and Exercised The following table represents information about stock options and stock appreciation rights exercised in each year.
 Year Ended December 31,
 202020192018
(amounts in thousands)
Total intrinsic value of options exercised$1 $130 $234 
Summary of Share Option Plans Activities The following table summarizes the Company’s activities with respect to all of its share option plans (issued under the 2014 Plan and the 1999 Plan) for the year ended December 31, 2020: 
Number of SharesOption PriceWeighted
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (in years)		Aggregate
Intrinsic
Value (amounts in thousands)
Share options outstanding, January 1, 20208,000 5.21$5.21  
Granted— ——  
Exercised(1,000)$5.21$5.21  
Forfeited/expired(7,000)$5.21$5.21  
Share options outstanding and exercisable, December 31, 2020— $—$—— $—