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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2020 80,295,141 3,945,867      
Balance at Dec. 31, 2020 $ 40 $ (9,999) $ 411,753 $ (184,909) $ 216,885
Vesting of restricted stock units and issuance of stock under incentive plans (in shares) 1,947,118 0      
Vesting of restricted stock units and issuance of stock under incentive plans $ 1 $ 0 135 0 136
Share-based compensation 0 0 2,503 0 2,503
Net loss $ 0 $ 0 0 (11,437) (11,437)
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares) 0 122,965      
Increase in treasury stock resulting from shares withheld to cover statutory taxes $ 0 $ (667) 0 0 (667)
Exercise of warrants by certain warrant holders (Note 7) (in shares) 198,000 0      
Exercise of warrants by certain warrant holders (Note 7) $ 0 $ 0 934 0 934
Balance (in shares) at Jun. 30, 2021 82,440,259 4,068,832      
Balance at Jun. 30, 2021 $ 41 $ (10,666) 415,325 (196,346) 208,354
Balance (in shares) at Mar. 31, 2021 82,228,823 4,055,011      
Balance at Mar. 31, 2021 $ 41 $ (10,623) 413,958 (191,167) 212,209
Vesting of restricted stock units and issuance of stock under incentive plans (in shares) 211,436 0      
Vesting of restricted stock units and issuance of stock under incentive plans $ 0 $ 0 136 0 136
Share-based compensation 0 0 1,231 0 1,231
Net loss $ 0 $ 0 0 (5,179) (5,179)
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares) 0 13,821      
Increase in treasury stock resulting from shares withheld to cover statutory taxes $ 0 $ (43) 0 0 (43)
Balance (in shares) at Jun. 30, 2021 82,440,259 4,068,832      
Balance at Jun. 30, 2021 $ 41 $ (10,666) 415,325 (196,346) 208,354
Balance (in shares) at Dec. 31, 2021 83,057,083 4,091,823      
Balance at Dec. 31, 2021 $ 42 $ (10,723) 419,059 (194,968) 213,410
Vesting of restricted stock units and issuance of stock under incentive plans (in shares) 1,088,999 0      
Vesting of restricted stock units and issuance of stock under incentive plans $ 0 $ 0 211 0 211
Share-based compensation 0 0 1,902 0 1,902
Net loss $ 0 $ 0 0 (58,957) $ (58,957)
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares)   208,329     208,329
Increase in treasury stock resulting from shares withheld to cover statutory taxes   $ (448)     $ (448)
Balance (in shares) at Jun. 30, 2022 84,146,082 4,300,152      
Balance at Jun. 30, 2022 $ 42 $ (11,171) 421,172 (253,925) 156,118
Balance (in shares) at Mar. 31, 2022 83,983,587 4,300,152      
Balance at Mar. 31, 2022 $ 42 $ (11,171) 420,285 (196,981) 212,175
Vesting of restricted stock units and issuance of stock under incentive plans (in shares) 162,495        
Vesting of restricted stock units and issuance of stock under incentive plans $ 0   0   0
Share-based compensation 0 0 887 0 887
Net loss $ 0 $ 0 0 (56,944) (56,944)
Balance (in shares) at Jun. 30, 2022 84,146,082 4,300,152      
Balance at Jun. 30, 2022 $ 42 $ (11,171) $ 421,172 $ (253,925) $ 156,118