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Significant Customers (Tables)
9 Months Ended
Sep. 30, 2020
Risks and Uncertainties [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights Outstanding warrants are summarized below as of September 30, 2020:
Common Shares in millions
Exercise priceVestedNon-VestedExpiration
2016 Investment Agreement$9.7314.90.0March 8, 2021
2018 Investment Agreement$21.5313.90.9December 20, 2025
2018 Investment Agreement$20.400.66.4December 20, 2025