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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, 2017 61,631,573 352,523      
Balance at Dec. 31, 2017 $ 31 $ (1,274) $ 392,687 $ (167,437) $ 224,007
Vesting of restricted stock units and issuance of restricted stock (in shares) 12,184,842      
Vesting of restricted stock units and issuance of restricted stock $ 6 (6)
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares) 872,562      
Increase in treasury stock resulting from shares withheld to cover statutory taxes $ (1,979) (1,979)
Share-based compensation expense 28,114 28,114
Net loss (19,575) (19,575)
Balance (in shares) at Jun. 30, 2018 76,509,709 1,225,085      
Balance at Jun. 30, 2018 $ 38 $ (3,253) 390,011 (191,474) 195,322
Vesting of restricted stock units and issuance of restricted stock (in shares) 6,706      
Vesting of restricted stock units and issuance of restricted stock
Share-based compensation expense 2,675 2,675
Net loss 4,462 4,462
Balance (in shares) at Dec. 31, 2018 76,525,581 1,233,198      
Balance at Dec. 31, 2018 $ 38 $ (3,272) 395,769 (185,369) 207,166
Vesting of restricted stock units and issuance of restricted stock (in shares) 2,048,901      
Vesting of restricted stock units and issuance of restricted stock $ 1 (1)
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares) 557,988     557,988
Increase in treasury stock resulting from shares withheld to cover statutory taxes $ (3,096) $ (3,096)
Share-based compensation expense 8,086 8,086
Net loss (2,703) (2,703)
Balance (in shares) at Jun. 30, 2019 78,534,774 1,785,489      
Balance at Jun. 30, 2019 $ 39 $ (6,351) 402,192 (183,609) 212,271
Vesting of restricted stock units and issuance of restricted stock (in shares) 39,708      
Vesting of restricted stock units and issuance of restricted stock
Increase in treasury stock resulting from shares withheld to cover statutory taxes (in shares) 5,697      
Increase in treasury stock resulting from shares withheld to cover statutory taxes $ (17) (17)
Reclassification of puttable option from equity to liability (1,150) (1,150)
Share-based compensation expense 2,812 2,812
Net loss $ (4,463) $ (4,463)