| Schedule of Share-based Compensation, Stock Options, Activity |
A summary of stock option activity for the year December 31, 2018 is as follows (in thousands except share amounts):
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Weighted
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Weighted
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Average
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Average
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Remaining
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Aggregate
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Exercise
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Contractual
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Intrinsic
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Shares
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Price
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Terms
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Value
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Options outstanding at December 31, 2017
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19,872,029
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$
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2.66
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7.7
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$
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—
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Granted
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2,679,667
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1.96
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—
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—
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Exercised
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(276,668)
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0.63
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—
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—
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Forfeited
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(246,378)
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2.91
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—
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—
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Expired
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(71,500)
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29.51
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—
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—
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Options outstanding at December 31, 2018
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21,957,150
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$
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2.51
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7.1
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$
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1,432
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Options exercisable at December 31, 2018
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14,964,985
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2.74
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6.3
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1,431
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Options unvested at December 31, 2018
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6,992,165
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$
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2.01
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8.9
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$
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1,467
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| Nonvested Restricted Stock Shares Activity |
A summary of restricted stock activity for the year ended December 31, 2018 is as follows (in thousands except share amounts):
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Aggregate
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Intrinsic
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Shares
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Value
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Unvested restricted stock at December 31, 2017
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234,744
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$
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—
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Granted
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2,347,347
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—
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Vested
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(234,744)
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—
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Unvested restricted stock at December 31, 2018
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2,347,347
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$
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2,911
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