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Share Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity
Stock option activity under the Plan is as follows:
Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term (Years)		Aggregate Intrinsic
Value
Outstanding as of December 31, 201814,079$2.19 
Granted
2,4893.01 
Exercised
(2,572)1.76 $6,477 
Cancelled / Forfeited
(135)2.81 
Outstanding as of December 31, 201913,8612.41 6.731,713 
Granted
3,3352.73 
Exercised
(939)1.93 1,072 
Cancelled / Forfeited
(736)2.83 
Outstanding as of December 31, 202015,5212.49 6.623,407 
Granted
2,6604.37 
Exercised
(2,307)2.27 5,052 
Cancelled / Forfeited
(297)3.02 
Outstanding as of December 31, 202115,577 2.83 6.513,839 
Exercisable as of December 31, 202110,644 $2.46 5.4$12,028 
Assumptions Used in Fair Value Measurement of Options Granted
Years Ended December 31,
202120202019
Risk-free interest rate0.8 %0.4 %1.9 %
Annualized volatility59.3 %59.4 %55.7 %
Weighted average expected life (in years)5.45.55.5
Expected dividend yield0.0 %0.0 %0.0 %
Schedule of Performance Stock Unit Awards and Restricted Stock Granted Under Long-Term Incentive Program
PSUs and RSUs granted under the LTIP are summarized as follows:
Performance Stock UnitsRestricted Stock Units
Number of
Shares
Weighted
Average Grant
Date Fair
Value
Number of
Shares
Weighted
Average Grant
Date Fair
Value
Outstanding as of December 31, 20181,842 $2.41 1,226 $2.44 
Granted
593 2.99 7892.92 
Incremental shares earned
59 1.25 — —
Vested / Settled
(415)1.18 (614)2.19 
Forfeited / Expired
(238)1.12 ——
Outstanding as of December 31, 20191,841 3.00 1,401 2.82 
Granted
605 2.00 1,078 2.73 
Incremental shares earned
77 3.10 — —
Vested / Settled
(388)3.11 (785)2.80 
Forfeited / Expired
(494)3.02 (127)2.83 
Outstanding as of December 31, 20201,641 2.61 1,567 2.77 
Granted
243 5.55 769 4.42 
Incremental shares earned
210 3.18 — — 
Vested / Settled
(766)2.86 (832)2.76 
Outstanding as of December 31, 20211,328 $3.04 1,504 $3.62 
Summary of Share Based Compensation Allocation Expense
Compensation costs incurred in connection with share-based awards are as follows:
Years Ended December 31,
202120202019
Stock options$4,102 $3,709 $3,436 
Restricted stock units$2,620 2,239 1,830 
Performance stock units$1,293 2,000 1,204 
Total share-based compensation expense$8,015 $7,948 $6,470 
Performance Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used in Fair Value Measurement of Options Granted The fair values of the TSR PSUs granted were determined using a Monte Carlo simulation and used the following inputs and assumptions:
2021 Award2020 Award2019 Award
Closing stock price on grant date$4.42 $2.73 $2.92 
Performance period starting price$3.70 $4.78 $3.01 
Term of award (in years)2.562.552.55
Volatility54.4 %57.5 %63.7 %
Risk-free interest rate0.23 %0.21 %1.79 %
Expected dividend yield0.00 %0.00 %0.00 %
Fair value per TSR PSU$5.55 $2.00 $3.18