Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation And Other Benefit Plans (Stock Option Valuation Assumptions) (Details)

v3.8.0.1
Stock-Based Compensation And Other Benefit Plans (Stock Option Valuation Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation of the options granted      
Weighted average exercise price - ($/share) $ 0.99 $ 1.14 $ 4.41
Expected life in years 3 years 2 months 12 days 3 years 2 years 6 months
Average expected volatility 73.00% 71.00% 61.00%
Risk-free interest rate 1.51% 1.10% 0.88%
Weighted average grant date fair value - ($/share) $ 0.49 $ 0.49 $ 1.65