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Share Based Compensation, Outstanding Stock Option Grants and Related Transactions (Details) - Stock Options [Member]
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Number of Shares [Roll Forward]  
Outstanding, beginning balance (in shares) 211,421
Granted (in shares) 0
Exercised (in shares) (70,299)
Forfeited (in shares) 0
Expired (in shares) (1,116)
Outstanding, ending balance (in shares) 140,006
Vested and expected to vest, period end (in shares) 140,006
Exercisable, period end (in shares) 140,006
Average Exercise Price [Roll Forward]  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 6.48
Exercised (in dollars per share) | $ / shares 9.98
Expired (in dollars per share) | $ / shares 22.35
Outstanding, ending balance (in dollars per share) | $ / shares 4.60
Vested and expected to vest, period end (in dollars per share) | $ / shares 4.60
Exercisable, period end (in dollars per share) | $ / shares $ 4.60
Weighted-Average Remaining Contractual Term (Years) [Abstract]  
Outstanding, weighted average remaining contractual term 3 years 2 months 12 days
Vested and expected to vest, weighted-average remaining contractual term 3 years 2 months 12 days
Exercisable, weighted average remaining contractual term 3 years 2 months 12 days
Aggregate Intrinsic Value [Abstract]  
Outstanding, aggregate intrinsic value | $ $ 2,340
Vested and expected to vest, aggregate intrinsic value | $ 2,340
Exercisable, aggregate intrinsic value | $ $ 2,340