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Equity - Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Risk-free interest rate 2.50% 2.20%
Expected term of options, in years 3 years 10 months 25 days 6 years 7 months 6 days
Expected annual volatility 123.60% 83.00%
Expected dividend yield 0.00% 0.00%
Determined weighted average grant date fair value per option $ 0.24 $ 0.18