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Stockholders' Equity - Summary of Weighted Average Assumptions Used to Compute Fair Value (Details) - Stock Options [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Expected volatility 147.60%
Weighted average risk-free interest rate 2.60%
Weighted average expected life (in years) 5 years 6 months
Weighted average grant date fair value $ 0.259