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Shareholder Equity - Share-Based Payments (Details) - shares
1 Months Ended 6 Months Ended
Jun. 19, 2019
Dec. 31, 2018
Aug. 31, 2018
Sep. 30, 2016
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option to purchase shares (in shares)   425,000   650,000 2,425,115
Outstanding classified as inducement awards (in shares)   3,941,947     5,779,044
Inducement awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding classified as inducement awards (in shares)         1,875,000
Chief Executive Officer | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option to purchase shares (in shares)     1,350,000    
2014 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in number of shares reserved for future issuance (in shares) 7,908,972        
Shares available for issuance (in shares)         9,045,174