Stockholders' Equity  Schedule of Sharebased Payment Award, Stock Options, Valuation Assumptions (Details) 
6 Months Ended  

Jun. 30, 2019 
Jun. 30, 2018 

Dividend yield  0.00%  0.00% 
Riskfree interest rate, minimum  1.90%  2.68% 
Riskfree interest rate, maximum  2.54%  2.97% 
Expected volatility, minimum  105.20%  116.30% 
Expected volatility, maximum  106.10%  137.33% 
Expected life (in years)  5 years  
Minimum [Member]  
Expected life (in years)  5 years  
Maximum [Member]  
Expected life (in years)  10 years 
X  
 Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://fasb.org/usgaap/role/ref/legacyRef

X  
 Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The maximum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition The minimum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition Expected term of award under sharebased payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/usgaap/role/ref/legacyRef

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